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a in (-oo:+oo)
6*(2*a+5) = 54 // - 54
6*(2*a+5)-54 = 0
6*(2*a+5)-54 = 0
12*a-24 = 0
12*a-24 = 0
12*a-24 = 0 // + 24
12*a = 24 // : 12
a = 24/12
a = 2
a = 2
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