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a in (-oo:+oo)
5*a-7 = 3*a+3 // - 3*a+3
5*a-(3*a)-7-3 = 0
5*a-3*a-7-3 = 0
2*a-10 = 0 // + 10
2*a = 10 // : 2
a = 10/2
a = 5
a = 5
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