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a in (-oo:+oo)
4*a+4 = 5*a+12 // - 5*a+12
4*a-(5*a)-12+4 = 0
4*a-5*a-12+4 = 0
-a-8 = 0 // + 8
-a = 8 // * -1
a = -8
a = -8
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