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(2*x)/7-x = x/28-(15/4) // - x/28-(15/4)
(2*x)/7-x-(x/28)+15/4 = 0
15/4-3/4*x = 0 // - 15/4
-3/4*x = -15/4 // : -3/4
x = -15/4/(-3/4)
x = 5
x = 5
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