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X in (-oo:+oo)
900 = (100*X)/3 // - (100*X)/3
900-((100*X)/3) = 0
(-100/3)*X+900 = 0
900-100/3*X = 0 // - 900
-100/3*X = -900 // : -100/3
X = -900/(-100/3)
X = 27
X = 27
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