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3*x-(7/4) = (9*x)/7 // - (9*x)/7
3*x-((9*x)/7)-(7/4) = 0
3*x+(-9/7)*x-7/4 = 0
12/7*x-7/4 = 0 // + 7/4
12/7*x = 7/4 // : 12/7
x = 7/4/12/7
x = 49/48
x = 49/48
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