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(3/4)*x+2/7 = (5/9)*x+3/4 // - (5/9)*x+3/4
(3/4)*x-((5/9)*x)+2/7-(3/4) = 0
(3/4)*x+(-5/9)*x+2/7-3/4 = 0
7/36*x-13/28 = 0 // + 13/28
7/36*x = 13/28 // : 7/36
x = 13/28/7/36
x = 117/49
x = 117/49
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