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(6/7)*x-(5*x)-3 = 340/7 // - 340/7
(6/7)*x-(5*x)-(340/7)-3 = 0
(6/7)*x-5*x-340/7-3 = 0
-29/7*x-361/7 = 0 // + 361/7
-29/7*x = 361/7 // : -29/7
x = 361/7/(-29/7)
x = -361/29
x = -361/29
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