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x in (-oo:+oo)
6*x+5 = 3*x-31 // - 3*x-31
6*x-(3*x)+5+31 = 0
6*x-3*x+5+31 = 0
3*x+36 = 0 // - 36
3*x = -36 // : 3
x = -36/3
x = -12
x = -12
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