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a in (-oo:+oo)
5*(3*a+3) = 45 // - 45
5*(3*a+3)-45 = 0
5*(3*a+3)-45 = 0
15*a-30 = 0
15*a-30 = 0
15*a-30 = 0 // + 30
15*a = 30 // : 15
a = 30/15
a = 2
a = 2
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