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x in (-oo:+oo)
58 = 6*x+2*x-6 // - 6*x+2*x-6
6-(6*x)-(2*x)+58 = 0
6-6*x-2*x+58 = 0
64-8*x = 0 // - 64
-8*x = -64 // : -8
x = -64/(-8)
x = 8
x = 8
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