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x in (-oo:+oo)
8-(2*x) = 6*x-56 // - 6*x-56
8-(2*x)-(6*x)+56 = 0
8-2*x-6*x+56 = 0
64-8*x = 0 // - 64
-8*x = -64 // : -8
x = -64/(-8)
x = 8
x = 8
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