Question

Tìm x thuộc Z, biết:

(x-3)-(4x+7)=-5x

Nhanh lên nhé.

Answer 1

Giải:

Ta có: (x - 3) - (4x + 7) = - 5x

⇔ x - 3 - 4x - 7 = -5x

⇔ x - 4x + 5x = 3 + 7

⇔ 2x = 10

⇔ x = 5

Vậy: x = 5

Answer 2

\(\left(x-3\right)-\left(4x+7\right)=-5x\\ \Leftrightarrow x-3-4x-7+5x=0\\ \Leftrightarrow x-4x+5x-3-7=0\\\Leftrightarrow 2x-10=0\\\Leftrightarrow 2x=10\\\Leftrightarrow x=5\)

Vậy \(x=5\)

Answer 3

( x - 3) - ( 4x + 7 ) = -5x

x - 3 - 4x - 7 + 5x = 0

2x - 10 = 0

2x = 10

x = 5