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a in (-oo:+oo)
5*(3-(6*a)) = -105 // + 105
5*(3-(6*a))+105 = 0
5*(3-6*a)+105 = 0
5*(3-6*a)+105 = 0
120-30*a = 0
120-30*a = 0
120-30*a = 0 // - 120
-30*a = -120 // : -30
a = -120/(-30)
a = 4
a = 4
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