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x in (-oo:+oo)
-(3*x)-10 = -2*x-12 // + -2*x-12
12-(3*x)-(-2*x)-10 = 0
2*x-3*x-10+12 = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
x = 2
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