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x in (-oo:+oo)
-(3*x)-10 = -25 // + 25
25-(3*x)-10 = 0
25-3*x-10 = 0
15-3*x = 0 // - 15
-3*x = -15 // : -3
x = -15/(-3)
x = 5
x = 5
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