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a in (-oo:+oo)
3*a+3 = 5*a-5 // - 5*a-5
3*a-(5*a)+3+5 = 0
3*a-5*a+3+5 = 0
8-2*a = 0 // - 8
-2*a = -8 // : -2
a = -8/(-2)
a = 4
a = 4
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