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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x+0.13*x)/x+(5*(42*x-44))/(44-555) = 0
(5*(42*x-44))/(-511)+(1.13*x)/x = 0
(5*x*(42*x-44))/(-511*x)+(-511*1.13*x)/(-511*x) = 0
5*x*(42*x-44)-511*1.13*x = 0
210*x^2-797.43*x = 0
210*x^2-797.43*x = 0
x*(210*x-797.43) = 0
210*x-797.43 = 0 // + 797.43
210*x = 797.43 // : 210
x = 797.43/210
x = 3.79728571
x*(x-3.79728571) = 0
(x*(x-3.79728571))/(-511*x) = 0
(x*(x-3.79728571))/(-511*x) = 0 // * -511*x
x*(x-3.79728571) = 0
( x-3.79728571 )
x-3.79728571 = 0 // + 3.79728571
x = 3.79728571
( x )
x = 0
x in { 0}
x = 3.79728571
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