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(5/7)*x-x = 2/7 // - 2/7
(5/7)*x-x-(2/7) = 0
(5/7)*x-x-2/7 = 0
-2/7*x-2/7 = 0 // + 2/7
-2/7*x = 2/7 // : -2/7
x = 2/7/(-2/7)
x = -1
x = -1
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