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a in (-oo:+oo)
5*(2-6*a) = -50 // + 50
5*(2-6*a)+50 = 0
5*(2-6*a)+50 = 0
60-30*a = 0
60-30*a = 0
60-30*a = 0 // - 60
-30*a = -60 // : -30
a = -60/(-30)
a = 2
a = 2
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