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(3/4)*x = 7-(5*x) // - 7-(5*x)
(3/4)*x+5*x-7 = 0
23/4*x-7 = 0 // + 7
23/4*x = 7 // : 23/4
x = 7/23/4
x = 28/23
x = 28/23
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