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(12/1)/3 = (x/3)/4 // - (x/3)/4
(12/1)/3-((x/3)/4) = 0
(-1/12)*x+12/3 = 0
4-1/12*x = 0 // - 4
-1/12*x = -4 // : -1/12
x = -4/(-1/12)
x = 48
x = 48
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