Question

 x+12 = -5-x

Answer 1

`x+12=-5-x`

`x+x=-5-12`

`2x=-17`

`x=-17/2`

Answer 2

Tham khảo:

x + 12 = (- 5) - x

x + 12 = (- x) - 5

x + 12 - 12 = (- x) - 5 - 12

x = (- x) - 5 - 12

x = (- x) - 17

x + x = (- x) - 17 + x

2x = (- x) - 17 + x

2x = (- 17)

\(\dfrac{2x}{2}\)= \(\dfrac{-17}{2}\)

x = \(\dfrac{-17}{2}\)

x = - \(\dfrac{17}{2}\)

Chúc bạn học tốt!

 

Answer 3

Ta có: x+12=-5-x

nên x+x=-5-12

hay \(x=-\dfrac{17}{2}\)