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(3*x)/4-x = x/20-(6/5) // - x/20-(6/5)
(3*x)/4-x-(x/20)+6/5 = 0
6/5-3/10*x = 0 // - 6/5
-3/10*x = -6/5 // : -3/10
x = -6/5/(-3/10)
x = 4
x = 4
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