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(4*x)/5-x = x/15-(12/5) // - x/15-(12/5)
(4*x)/5-x-(x/15)+12/5 = 0
12/5-4/15*x = 0 // - 12/5
-4/15*x = -12/5 // : -4/15
x = -12/5/(-4/15)
x = 9
x = 9
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