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x=-6+18/-2
x=12/-2
x=-6
-6 + 18 = -2x
12 = -2x
12 : -2 = x
-6
Comprobamos:
-6 = -2x - 18
-6 = -2 . -6 - 18
-6 = 12 - 18
-6 = -6