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a in (-oo:+oo)
3*a-(4*a)+2 = 13 // - 13
3*a-(4*a)-13+2 = 0
3*a-4*a-13+2 = 0
-a-11 = 0 // + 11
-a = 11 // * -1
a = -11
a = -11
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