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x in (-oo:+oo)
0 = (9000-(25*x))/18 // - (9000-(25*x))/18
0-((9000-(25*x))/18) = 0
-((9000-25*x)/18) = 0
(-1*(9000-25*x))/18 = 0
9000-25*x = 0 // - 9000
-25*x = -9000 // : -25
x = -9000/(-25)
x = 360
x = 360
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