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