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a in (-oo:+oo)
6*(4-2*a) = -120 // + 120
6*(4-2*a)+120 = 0
6*(4-2*a)+120 = 0
144-12*a = 0
144-12*a = 0
144-12*a = 0 // - 144
-12*a = -144 // : -12
a = -144/(-12)
a = 12
a = 12
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