Resposta:
5/2 ou 2,5
Explica
5 – 2(x + (- 1)) = 2
5 – 2x – (- 2) = 2
5 – 2x + 2 = 2
7 – 2x = 2
– 2x = 2 – 7
– 2x = – 5
x = – 5/- 2
x = 5/2