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a in (-oo:+oo)
5*a-3 = 2*a+21 // - 2*a+21
5*a-(2*a)-21-3 = 0
5*a-2*a-21-3 = 0
3*a-24 = 0 // + 24
3*a = 24 // : 3
a = 24/3
a = 8
a = 8
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