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(4*x)/5-x = x/15-(8/5) // - x/15-(8/5)
(4*x)/5-x-(x/15)+8/5 = 0
8/5-4/15*x = 0 // - 8/5
-4/15*x = -8/5 // : -4/15
x = -8/5/(-4/15)
x = 6
x = 6
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