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D( x )
x+3 = 0
x-10 = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x-10 = 0
x-10 = 0
x-10 = 0 // + 10
x = 10
x in (-oo:-3) U (-3:10) U (10:+oo)
6/(x+3) = 4/(x-10) // - 4/(x-10)
6/(x+3)-(4/(x-10)) = 0
6/(x+3)-4*(x-10)^-1 = 0
6/(x+3)-4/(x-10) = 0
(6*(x-10))/((x+3)*(x-10))+(-4*(x+3))/((x+3)*(x-10)) = 0
6*(x-10)-4*(x+3) = 0
2*x-72 = 0
(2*x-72)/((x+3)*(x-10)) = 0
(2*x-72)/((x+3)*(x-10)) = 0 // * (x+3)*(x-10)
2*x-72 = 0
2*x-72 = 0 // + 72
2*x = 72 // : 2
x = 72/2
x = 36
x = 36
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