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