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D( x )
x+5 = 0
4*x-1 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x in (-oo:-5) U (-5:1/4) U (1/4:+oo)
7/(4*x-1) = 2/(x+5) // - 2/(x+5)
7/(4*x-1)-(2/(x+5)) = 0
7/(4*x-1)-2*(x+5)^-1 = 0
7/(4*x-1)-2/(x+5) = 0
(7*(x+5))/((4*x-1)*(x+5))+(-2*(4*x-1))/((4*x-1)*(x+5)) = 0
7*(x+5)-2*(4*x-1) = 0
37-x = 0
(37-x)/((4*x-1)*(x+5)) = 0
(37-x)/((4*x-1)*(x+5)) = 0 // * (4*x-1)*(x+5)
37-x = 0
37-x = 0 // - 37
-x = -37 // * -1
x = 37
x = 37
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