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a in (-oo:+oo)
6*(3*a-2) = -120 // + 120
6*(3*a-2)+120 = 0
6*(3*a-2)+120 = 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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