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a in (-oo:+oo)
4*(1-(3*a)) = -56 // + 56
4*(1-(3*a))+56 = 0
4*(1-3*a)+56 = 0
4*(1-3*a)+56 = 0
60-12*a = 0
60-12*a = 0
60-12*a = 0 // - 60
-12*a = -60 // : -12
a = -60/(-12)
a = 5
a = 5
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