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x in (-oo:+oo)
X-11 = (1/3)*x // - (1/3)*x
X-((1/3)*x)-11 = 0
X+(-1/3)*x-11 = 0
X-1/3*x-11 = 0 // - X-11
-1/3*x = -(X-11) // : -1/3
x = (-(X-11))/(-1/3)
x = -3*(11-X)
x = -3*(11-X)
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