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(5/7)*x-(3/5) = 4*x-837/245 // - 4*x-837/245
(5/7)*x-(4*x)-(3/5)-(-837/245) = 0
(5/7)*x-4*x-3/5+837/245 = 0
138/49-23/7*x = 0 // - 138/49
-23/7*x = -138/49 // : -23/7
x = -138/49/(-23/7)
x = 6/7
x = 6/7
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