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a in (-oo:+oo)
4*(1-(3*a)) = -68 // + 68
4*(1-(3*a))+68 = 0
4*(1-3*a)+68 = 0
4*(1-3*a)+68 = 0
72-12*a = 0
72-12*a = 0
72-12*a = 0 // - 72
-12*a = -72 // : -12
a = -72/(-12)
a = 6
a = 6
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