Question

Tìm x biết:

(x - 5) - 7(x + 4) = 5 - 7x

Answer 1

(x - 5) - 7(x + 4) = 5 - 7x

=> x - 5 - 7x - 28 = 5 - 7x

=> -6x - 33 = 5 - 7x

=> -6x + 7x = 5 + 33

=> x = 38

Answer 2

\(\left(x-5\right)-7\left(x+4\right)=5-7x\)

\(\Leftrightarrow x-5-7x-28=5-7x\)

\(\Leftrightarrow-6x-33=5-7x\)

\(\Leftrightarrow-6x+7x=33+5\)\(\Leftrightarrow x=38\)

Answer 3

(x - 5) - 7(x + 4) = 5 - 7x

( x - 5) - 7x + 28 = 5 - 7x

(x-5) + 28 - 7x = 5 - 7x

=> ( x - 5 ) + 28 =5 

=> x - 5 = -23

=> x = - 18 

Answer 4

\(x-5-7\left(x+4\right)=5-7x\)

\(x-5-7x-28=5-7x\)

\(-8x-33=5-7x\)

\(-x=38\)

\(x=-38\)

Answer 5

mk giải nhầm nha 

Answer 6

(x - 5) - 7(x + 4) = 5 - 7x

( x - 5 ) - 7x - 28 = 5 - 7x  

( x - 5 ) - 28 - 7x = 5 - 7x

=> ( x - 5 ) - 28 = 5 

=> x - 5 = 33 => x = 38 

Answer 7

\(\left(x-5\right)-7\left(x+4\right)=5-7x\)

\(x-5-7x-28=5-7x\)

\(-6x-33=5-7x\)

\(x=5+33\)

\(\Rightarrow x=38\)