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(5/7)*x-1/10 = 143/70 // - 143/70
(5/7)*x-1/10-(143/70) = 0
(5/7)*x-1/10-143/70 = 0
5/7*x-15/7 = 0 // + 15/7
5/7*x = 15/7 // : 5/7
x = 15/7/5/7
x = 3
x = 3
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