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(5*x)/3-x = x/15-(12/5) // - x/15-(12/5)
(5*x)/3-x-(x/15)+12/5 = 0
3/5*x+12/5 = 0 // - 12/5
3/5*x = -12/5 // : 3/5
x = -12/5/3/5
x = -4
x = -4
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