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(5/2)*x = 3/7 // - 3/7
(5/2)*x-(3/7) = 0
(5/2)*x-3/7 = 0
5/2*x-3/7 = 0 // + 3/7
5/2*x = 3/7 // : 5/2
x = 3/7/5/2
x = 6/35
x = 6/35
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