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x in (-oo:+oo)
((1/2)*x)/(3/4) = (3/4)*x // - (3/4)*x
((1/2)*x)/(3/4)-((3/4)*x) = 0
((1/2)*x)/(3/4)+(-3/4)*x = 0
-1/12*x = 0 // : -1/12
x = 0
x = 0
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