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x in (-oo:+oo)
6/15 = (2*x)/25 // - (2*x)/25
6/15-((2*x)/25) = 0
(-2/25)*x+6/15 = 0
2/5-2/25*x = 0 // - 2/5
-2/25*x = -2/5 // : -2/25
x = -2/5/(-2/25)
x = 5
x = 5
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