Question

Tìm số nguyên x biết:

7*(x+10) - 8*(x-5)=118

 

Answer 1

Ta có \(7.\left(x+10\right)-8.\left(x-5\right)=118\)

\(\Rightarrow7x+70-8x+40=118\)

\(\Rightarrow-x+110=118\)

\(\Rightarrow-x=8\)

\(\Rightarrow x=-8\)

Answer 2

7(x+10)-8(x-5)=118

<=>7x+70-8x+40=118

<=>110-x=118

<=>-x=118-110

<=>-x=8

<=>x=-8

Vậy x=-8

Answer 3

7(x+10) - 8(x-5) = 118

7x + 70 - 8x - 40 = 118

-x + 110 = 118

-x = 118 - 110

-x = 8

x = -8

Vậy x = -8