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(4*x)/5-x = x/20-(3/4) // - x/20-(3/4)
(4*x)/5-x-(x/20)+3/4 = 0
3/4-1/4*x = 0 // - 3/4
-1/4*x = -3/4 // : -1/4
x = -3/4/(-1/4)
x = 3
x = 3
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