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X in (-oo:+oo)
7 = X/(6000/40) // - X/(6000/40)
7-(X/(6000/40)) = 0
(-1/150)*X+7 = 0
7-1/150*X = 0 // - 7
-1/150*X = -7 // : -1/150
X = -7/(-1/150)
X = 1050
X = 1050
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