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D( x )
1.15^2 = 0
1.15^2 = 0
1.15^2 = 0
1.15^2 = 0
x belongs to the empty set
x in (-oo:+oo)
45.465 = x/1.15+x/(1.15^2) // - x/1.15+x/(1.15^2)
45.465-(x/1.15)-(x/(1.15^2)) = 0
45.465-0.86956522*x-(x/(1.15^2)) = 0
(-(1.15^-2+0.86956522))*x+45.465 = 0 // - 45.465
(-(1.15^-2+0.86956522))*x = -45.465 // : -(1.15^-2+0.86956522)
x = -45.465/(-(1.15^-2+0.86956522))
x = 45.465/(1.15^-2+0.86956522)
x = 45.465/(1.15^-2+0.86956522)
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