Question

Решите уравнение:x+9=-x/2

Answer 1

x + 9 = - x/2     /*2
2 (x+ 9) = - x
2x + 18 = - x
2x + x = - 18
3x = - 18
x = - 6 

Answer 2

x+9=-x/2
2x+2*9=-2*(x/2)
2x+18=-x
2x+x=-18
3x=-18
x=-18:3
x=-6