Question

- 10 - 20 -5 = - 5 - 2 x Qual á resposta?

Answer 1

Oi, 
-10 -20 -5 = -5 -2x
2x = 10 + 20 + 5 -5
2x = 35 - 5
2x = 30
x = 30
      2
x = 15

Answer 2

- 10 - 20 - 5 = - 5 - 2x
  2x = - 5 + 5 + 20 + 10
  2x = 30
    x = 30
           2
    x = 15