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a in (-oo:+oo)
6*(a+10) = 72 // - 72
6*(a+10)-72 = 0
6*(a+10)-72 = 0
6*a-12 = 0
6*a-12 = 0
6*a-12 = 0 // + 12
6*a = 12 // : 6
a = 12/6
a = 2
a = 2
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