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x in (-oo:+oo)
2*x-5 = 6*x+31 // - 6*x+31
2*x-(6*x)-31-5 = 0
2*x-6*x-31-5 = 0
-4*x-36 = 0 // + 36
-4*x = 36 // : -4
x = 36/(-4)
x = -9
x = -9
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