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(3/5)*x+1/2 = 4/7 // - 4/7
(3/5)*x+1/2-(4/7) = 0
(3/5)*x+1/2-4/7 = 0
3/5*x-1/14 = 0 // + 1/14
3/5*x = 1/14 // : 3/5
x = 1/14/3/5
x = 5/42
x = 5/42
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