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x in (-oo:+oo)
X-((1/3)*x) = 800 // - 800
X-((1/3)*x)-800 = 0
X+(-1/3)*x-800 = 0
X-1/3*x-800 = 0 // - X-800
-1/3*x = -(X-800) // : -1/3
x = (-(X-800))/(-1/3)
x = -3*(800-X)
x = -3*(800-X)
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