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x in (-oo:+oo)
10/15 = (15*x)/15 // - (15*x)/15
10/15-((15*x)/15) = 0
10/15-x = 0
2/3-x = 0 // - 2/3
-x = -2/3 // * -1
x = 2/3
x = 2/3
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