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x in (-oo:+oo)
-2*x-7 = 6*x-31 // - 6*x-31
31-2*x-(6*x)-7 = 0
31-2*x-6*x-7 = 0
24-8*x = 0 // - 24
-8*x = -24 // : -8
x = -24/(-8)
x = 3
x = 3
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