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(6*x)/5-x = x/15-(10/13) // - x/15-(10/13)
(6*x)/5-x-(x/15)+10/13 = 0
2/15*x+10/13 = 0 // - 10/13
2/15*x = -10/13 // : 2/15
x = -10/13/2/15
x = -75/13
x = -75/13
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