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(5/4)*x+3/7 = 8/28 // - 8/28
(5/4)*x+3/7-(8/28) = 0
(5/4)*x+3/7-2/7 = 0
5/4*x+1/7 = 0 // - 1/7
5/4*x = -1/7 // : 5/4
x = -1/7/5/4
x = -4/35
x = -4/35
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