a, 453 + \(x\) = -443 + (-199 + \(x\))

   453 + \(x\) = -443 - 199 + \(x\)

   \(x\) - \(x\)    = 443 + 199  + 453 

         0  = 1095 (vô lí)

Không có giá trị nào của \(x\) thỏa mãn đề bài

b, -(754 + \(x\)) = (\(x\) - 12 - 741) - 23

   - 754 - \(x\)   = \(x\) - 12 - 741 - 23

       \(x\) + \(x\)    = 12 + 741 + 23 - 754

        2\(x\)       = 22

          \(x\)        = 22 : 2

           \(x\)        = 11

dễ 

tick mình làm cho câu a

A )X THUỘC RỖNG

B) X=11

b, x-96=(443-x)-15

x-96=443-x-15

x-96=428-x

x+x=428+96

2x=524

x=262

a, (x-12)-15=(20-7)-(18+x)

x-12-15=13-18-x

x-27=-5-x

x+x=-5+27

2x=22

x=11

( - x + 281 + 534 ) = 449 + ( x - 48 )

=> - x + 815 = 499 + x - 48

=> - x - x = 499 - 48 - 815

=> -2x = 1266

=> x = - 633

- ( 754 + x ) = ( x - 12 - 741 ) - 23

=> - 754 - x = x - 12 - 741 - 23

=> - x - x = - 12 - 741 - 23 + 754

=> - 2x = - 22

=> x = 11

(-x+281+534 ) = 449 + ( x - 48 )

=> - x + 815 = 499 + x - 48

=> -  x - x = 499 - 48 - 815

=> - 2x = 1266

=> x = - 633

-(754+x)=(x-12-741)-23

=>-754-x=x-12-741-23

=>-x-x=-12-741-23+754

=>-2x=-22

=>x=11

a)   \(-x+821+534=499+\left(x-84\right)\)

\(-x-x=499-84-821-534\)

\(-2x=-940\)

\(x=470\)

b)  \(x-96=\left(448-x\right)-150\)

\(x+x=448-150+96\)

\(2x=394\)

\(x=197\)

c)  \(-\left(754+x\right)=\left(x-12-741\right)-23\)

\(-754-x=x-12-741-23\)

\(-x+x=-12-741-23+754\)

\(0x=2\)

\(x\)ko tồn tại

d) \(\left(6+x\right)-\left(17-21\right)=-25\)

\(6+x-17+21=-25\)

\(x=-25-6+17-21\)

\(x=-35\)

e)  \(17-\left(x+2\right)=3\)

\(17-x-2=3\)

\(-x=3-17+2\)

\(-x=-12\)

\(x=12\)

h)  \(-10-\left(31-x\right)=40\)

\(-10-31+x=40\)

\(x=40+10+31\)

\(x=81\)

k mk nha bạn    

a) - x + 821 + 534 = 499 + ( x - 84 )

<=> -x + 821 + 534 = 499 + x - 84

<=> 2x = 940

<=> x = 470

b, x - 96 = ( 448 - x ) - 150

<=> x - 96 = 448 - x - 150

<=> 2x = 394

<=> x = 157

Cac phan con lai tuong tu

a) \(-x+821+534=499+\left(x-84\right)\)

\(\Leftrightarrow-x+821+534=499+x-84\)

\(\Leftrightarrow821+534-499+84=x+x\)

\(\Leftrightarrow940=2x\)

\(\Leftrightarrow x=\dfrac{940}{2}\)

\(\Leftrightarrow x=470\)

Vậy \(x=470\)

b) \(x-96=\left(448-x\right)-150\)

\(\Leftrightarrow x-96=448-x-150\)

\(\Leftrightarrow x+x=96+448-150\)

\(\Leftrightarrow2x=394\)

\(\Leftrightarrow x=\dfrac{394}{2}\)

\(\Leftrightarrow x=197\)

Vậy \(x=197\)

c) \(- (754 + x) = (x - 12 - 741) - 23\)

\(\Leftrightarrow-754-x=x-12-741-23\)

\(\Leftrightarrow-754+12+741+23=x+x\)

\(\Leftrightarrow22=2x\)

\(\Leftrightarrow x=\dfrac{22}{2}\)

\(\Leftrightarrow x=11\)

Vậy \(x=11\)

d) \((6 + x) - (17 - 21) = -25\)

\(\Leftrightarrow6+x-17+21=-25\)

\(\Leftrightarrow x=-25-6+17-21\)

\(\Leftrightarrow x=-35\)

Vậy \(x=-35\)

e) \(17-\left(x+2\right)=3\)

\(\Leftrightarrow17-x-2=3\)

\(\Leftrightarrow17-2-3=x\)

\(\Leftrightarrow x=12\)

Vậy \(x=12\)

h) \(-10 - (31 - x) = 40\)

\(\Leftrightarrow-10-31+x=40\)

\(\Leftrightarrow x=40+10+31\)

\(\Leftrightarrow x=81\)

Vậy \(x=81\)

a) - x + 821 + 534 = 499 + (x - 84)

= (856 - x) + 499 = 499 + ( x- 84)

=> (x-84) = (856 - x).

= ...

Trần Đăng Nhất, Cold Wind giúp mik với các bạn ơi !