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x in (-oo:+oo)
4*(5-3*x) = 140 // - 140
4*(5-3*x)-140 = 0
4*(5-3*x)-140 = 0
-12*x-120 = 0
-12*x-120 = 0
-12*x-120 = 0 // + 120
-12*x = 120 // : -12
x = 120/(-12)
x = -10
x = -10
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