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a in (-oo:+oo)
6*(3*a+5) = 138 // - 138
6*(3*a+5)-138 = 0
6*(3*a+5)-138 = 0
18*a-108 = 0
18*a-108 = 0
18*a-108 = 0 // + 108
18*a = 108 // : 18
a = 108/18
a = 6
a = 6
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