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x in (-oo:+oo)
3*(1-4*x) = -57 // + 57
3*(1-4*x)+57 = 0
3*(1-4*x)+57 = 0
60-12*x = 0
60-12*x = 0
60-12*x = 0 // - 60
-12*x = -60 // : -12
x = -60/(-12)
x = 5
x = 5
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