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a in (-oo:+oo)
6*(2*a+4) = 72 // - 72
6*(2*a+4)-72 = 0
6*(2*a+4)-72 = 0
12*a-48 = 0
12*a-48 = 0
12*a-48 = 0 // + 48
12*a = 48 // : 12
a = 48/12
a = 4
a = 4
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