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x in (-oo:+oo)
5*(-x-2) = -70 // + 70
5*(-x-2)+70 = 0
5*(-x-2)+70 = 0
60-5*x = 0
60-5*x = 0
60-5*x = 0 // - 60
-5*x = -60 // : -5
x = -60/(-5)
x = 12
x = 12
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