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a in (-oo:+oo)
5*a-(7*a)+3 = -3 // + 3
5*a-(7*a)+3+3 = 0
5*a-7*a+3+3 = 0
6-2*a = 0 // - 6
-2*a = -6 // : -2
a = -6/(-2)
a = 3
a = 3
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