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D( x )
x+5 = 0
2*x+4 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
2*x+4 = 0
2*x+4 = 0
2*x+4 = 0 // - 4
2*x = -4 // : 2
x = -4/2
x = -2
x in (-oo:-5) U (-5:-2) U (-2:+oo)
10/(2*x+4) = 4/(x+5) // - 4/(x+5)
10/(2*x+4)-(4/(x+5)) = 0
10/(2*x+4)-4*(x+5)^-1 = 0
10/(2*x+4)-4/(x+5) = 0
(10*(x+5))/((2*x+4)*(x+5))+(-4*(2*x+4))/((2*x+4)*(x+5)) = 0
10*(x+5)-4*(2*x+4) = 0
2*x+34 = 0
(2*x+34)/((2*x+4)*(x+5)) = 0
(2*x+34)/((2*x+4)*(x+5)) = 0 // * (2*x+4)*(x+5)
2*x+34 = 0
2*x+34 = 0 // - 34
2*x = -34 // : 2
x = -34/2
x = -17
x = -17
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