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x in (-oo:+oo)
3*x = 4*(1/4) // - 4*(1/4)
3*x-(4*(1/4)) = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x = 1/3
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