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x in (-oo:+oo)
15-((1/15)*x) = (1/10)*x // - (1/10)*x
15-((1/15)*x)-((1/10)*x) = 0
(-1/15)*x+(-1/10)*x+15 = 0
15-1/6*x = 0 // - 15
-1/6*x = -15 // : -1/6
x = -15/(-1/6)
x = 90
x = 90
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