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x in (-oo:+oo)
12/(1/3) = x/(3/4) // - x/(3/4)
12/(1/3)-(x/(3/4)) = 0
(-4/3)*x+12/(1/3) = 0
36-4/3*x = 0 // - 36
-4/3*x = -36 // : -4/3
x = -36/(-4/3)
x = 27
x = 27
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