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a in (-oo:+oo)
5 = 6*a-5*a-3 // - 6*a-5*a-3
3-(-5*a)-(6*a)+5 = 0
5*a-6*a+3+5 = 0
8-a = 0 // - 8
-a = -8 // * -1
a = 8
a = 8
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