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el opuesto de 8 es - 8
⇒
(X . -8 ) - 10 = 170
- 8X = 170 - 10
-8X = 160 ⇒ X = - 20
luego
sea z el entero
⇒
12z + 20 = - 124
12z = - 124 - 20
12z = - 144 ⇒ z = - 12
suerte