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(4*x)/5-x = x/10-(7/2) // - x/10-(7/2)
(4*x)/5-x-(x/10)+7/2 = 0
7/2-3/10*x = 0 // - 7/2
-3/10*x = -7/2 // : -3/10
x = -7/2/(-3/10)
x = 35/3
x = 35/3
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