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(2*x)/3-x = x/15-(4/5) // - x/15-(4/5)
(2*x)/3-x-(x/15)+4/5 = 0
4/5-2/5*x = 0 // - 4/5
-2/5*x = -4/5 // : -2/5
x = -4/5/(-2/5)
x = 2
x = 2
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