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(3*X)/4-((7*x)/12) = 0
(3*X)/4+(-7/12)*x = 0
3/4*X-7/12*x = 0 // - 3/4*X
-7/12*x = -(3/4*X) // : -7/12
x = (-(3/4*X))/(-7/12)
x = 9/7*X
x = 9/7*X
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