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(5*x)/2-x = x/10-(21/5) // - x/10-(21/5)
(5*x)/2-x-(x/10)+21/5 = 0
7/5*x+21/5 = 0 // - 21/5
7/5*x = -21/5 // : 7/5
x = -21/5/7/5
x = -3
x = -3
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