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(5*x)/2-x = x/10-(28/5) // - x/10-(28/5)
(5*x)/2-x-(x/10)+28/5 = 0
7/5*x+28/5 = 0 // - 28/5
7/5*x = -28/5 // : 7/5
x = -28/5/7/5
x = -4
x = -4
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