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