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x in (-oo:+oo)
3-7*x = 3*x+83 // - 3*x+83
3-7*x-(3*x)-83 = 0
3-7*x-3*x-83 = 0
-10*x-80 = 0 // + 80
-10*x = 80 // : -10
x = 80/(-10)
x = -8
x = -8
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