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x in (-oo:+oo)
5*x-8 = 3*x-20 // - 3*x-20
5*x-(3*x)-8+20 = 0
5*x-3*x-8+20 = 0
2*x+12 = 0 // - 12
2*x = -12 // : 2
x = -12/2
x = -6
x = -6
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