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(2*x)/7-(2*x) = x/2+17/2 // - x/2+17/2
(2*x)/7-(2*x)-(x/2)-(17/2) = 0
(2*x)/7-2*x-(x/2)-17/2 = 0
-31/14*x-17/2 = 0 // + 17/2
-31/14*x = 17/2 // : -31/14
x = 17/2/(-31/14)
x = -119/31
x = -119/31
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