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