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(4*x)/5-x = x/15-(20/3) // - x/15-(20/3)
(4*x)/5-x-(x/15)+20/3 = 0
20/3-4/15*x = 0 // - 20/3
-4/15*x = -20/3 // : -4/15
x = -20/3/(-4/15)
x = 25
x = 25
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