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x in (-oo:+oo)
x-(3*x)+5 = 15 // - 15
x-(3*x)-15+5 = 0
x-3*x-15+5 = 0
-2*x-10 = 0 // + 10
-2*x = 10 // : -2
x = 10/(-2)
x = -5
x = -5
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