a)-5 ( 3x - 7 ) - ( -15x +3 ) - ( 12-x )= -4
=>-15x+35+15x-3-12+x=-4
=>(-15x+15x)+(35-3-12)+x=-4
=>0+20+x=-4
=>20+x=-4
=>x=-4-20
=>x=-24
b)-3 ( 4x -2 ) - ( -12x +8 ) - (-x)=0
=>-12x+6+12x-8+x=0
=>(-12x+12x)+(6-8)+x=0
=>0+(-2)+x=0
=>(-2)+x=0
=>x=0-(-2)
=>x=2
tìm x
a)-5.(-x+7)-3.(-x-5)=-4.(12-x)+48
b) (-x-7)-5.(-x-3)=12.(3-x)
c)-2.(15-3x)-4.(7x+8)=-5-9.(-2x+1)
d) (-3x-7) - 4.(-2x-11)=7.(4x+10)+9
tìm x biết a, 128 - 3 x ( x + 4 ) = 13 ; b , ( 12x - 4 ^ 3 ) x 8 ^3 = 4 x 8 ^ 4 ; c, [ ( 4x + 28 ) x 23 + 55 ] : 5 = 35
1. |48 - 3x| = 0
2. |-x - 7|= 24
3. |4 - x| = 21
4. |x + 8| + 12 = 0
5. 6 - |x| = 2
Tìm số nguyên x
1/ \(17x+3\left(-16x-37\right)=2x+43-4x\)
2/ \(-2x-3\left(x-17\right)=34-2\left(-x+25\right)\)
3/ \(\left\{-3x+2\left[45-x-3\left(3x+7\right)-2x\right]+4x\right\}=55-103-57:\left[-2\left(2x-1\right)^2-\left(-9\right)^0\right]=-106\)
4/ \(-2x+3\left\{12-2\left[3x-\left(20+2x\right)-4x\right]+1\right\}=45\)
5/ \(3x-32>-5+1\)
6/ \(15+4x< 2x-145\)
7/ \(-3\left(2x+5\right)-16< -4\left(3-2x\right)\)
8/ \(-2x+15< 3x-7< 19-x\)
TÌm x, biết:
a, 512-(128-5x)=3x+12
b, (2x-1)+(4x-2)+...+(400x-200)=5+10+...+1000
c, (x+2)+(4x+4)+(7x+6)+...+(25x+18)+28x+20)=1560
d, x+4x+5x+9x+14x+...+97x=500
e, 720-[41-(2x-5)]=23.5
f, 697:\(\dfrac{15x+364}{x}\)=17
Tìm x , biết
d) \(\left(3x-2^4\right).7^3=2.7^4\)
e) x - [ 42 + ( -28 ) ] = -8
g) x - 7 = -5
h) 15 - 5( x + 4 ) = -12 - 3
i) ( 7 - x ) - ( 25 + 7 ) = -25
k) l x + 2 l = 0
l) l x - 3 l = 7 - ( -2 )
m) lx - 5l = l-7l
Tìm x biết
a)-15x + 20 = -25 b) 7(x-3)-3(-x+5)=14
c)4x-33=-77 d)|x+2|=5
Tìm x:
a. 2x(x - 1) - x(4 - x) = 0
b. 3(1 - 4x)(x - 1) + 4(3x - 2)(x + 3) = -27
Tìm x biết
a ) ( 2x - 1 ) . ( 5x + 2 ) = 0
b ) 3/7 + 3/7 : x = -1/2 - ( -3/4 )
c ) ( 3x + 5 ) . ( 2x - 3 ) < 0
