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a in (-oo:+oo)
4*a+5 = 5*a+17 // - 5*a+17
4*a-(5*a)-17+5 = 0
4*a-5*a-17+5 = 0
-a-12 = 0 // + 12
-a = 12 // * -1
a = -12
a = -12
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