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(2*x)/5+1/2 = x-(7/10) // - x-(7/10)
(2*x)/5-x+1/2+7/10 = 0
6/5-3/5*x = 0 // - 6/5
-3/5*x = -6/5 // : -3/5
x = -6/5/(-3/5)
x = 2
x = 2
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