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D( x )
x+135 = 0
x+135 = 0
x+135 = 0
x+135 = 0 // - 135
x = -135
x in (-oo:-135) U (-135:+oo)
135/(x+135) = 0.6 // - 0.6
135/(x+135)-0.6 = 0
135/(x+135)+(-0.6*(x+135))/(x+135) = 0
135-0.6*(x+135) = 0
54-0.6*x = 0
(54-0.6*x)/(x+135) = 0
(54-0.6*x)/(x+135) = 0 // * x+135
54-0.6*x = 0
54-0.6*x = 0 // - 54
-0.6*x = -54 // : -0.6
x = -54/(-0.6)
x = 90
x = 90
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