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7/12 = (3*x)/12 // - (3*x)/12
7/12-((3*x)/12) = 0
(-1/4)*x+7/12 = 0
7/12-1/4*x = 0 // - 7/12
-1/4*x = -7/12 // : -1/4
x = -7/12/(-1/4)
x = 7/3
x = 7/3
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