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(3/4)*x+(2/7)*x = 9/4 // - 9/4
(3/4)*x+(2/7)*x-(9/4) = 0
(3/4)*x+(2/7)*x-9/4 = 0
29/28*x-9/4 = 0 // + 9/4
29/28*x = 9/4 // : 29/28
x = 9/4/29/28
x = 63/29
x = 63/29
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