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x in (-oo:+oo)
-11/15 = (12/15)*x // - (12/15)*x
-((12/15)*x)-11/15 = 0
(-4/5)*x-11/15 = 0
-4/5*x-11/15 = 0 // + 11/15
-4/5*x = 11/15 // : -4/5
x = 11/15/(-4/5)
x = -11/12
x = -11/12
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