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x in (-oo:+oo)
3*(1-4*x) = -105 // + 105
3*(1-4*x)+105 = 0
3*(1-4*x)+105 = 0
108-12*x = 0
108-12*x = 0
108-12*x = 0 // - 108
-12*x = -108 // : -12
x = -108/(-12)
x = 9
x = 9
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