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(5*x)/7 = 3/4 // - 3/4
(5*x)/7-(3/4) = 0
(5*x)/7-3/4 = 0
5/7*x-3/4 = 0 // + 3/4
5/7*x = 3/4 // : 5/7
x = 3/4/5/7
x = 21/20
x = 21/20
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