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D( x )
3*x = 0
x = 0
x+1 = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x = 0
x = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:0) U (0:+oo)
2/(3*x)+4/x = 7/(x+1) // - 7/(x+1)
2/(3*x)-(7/(x+1))+4/x = 0
2/(3*x)-7*(x+1)^-1+4/x = 0
2/(3*x)-7/(x+1)+4/x = 0
(-7*3*x*x)/(3*x*x*(x+1))+(2*x*(x+1))/(3*x*x*(x+1))+(3*4*x*(x+1))/(3*x*x*(x+1)) = 0
2*x*(x+1)+3*4*x*(x+1)-7*3*x*x = 0
12*x^2-19*x^2+2*x+12*x = 0
14*x-7*x^2 = 0
14*x-7*x^2 = 0
7*x*(2-x) = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
7*x*(x-2) = 0
(7*x*(x-2))/(3*x*x*(x+1)) = 0
(7*x*(x-2))/(3*x*x*(x+1)) = 0 // * 3*x*x*(x+1)
7*x*(x-2) = 0
( 7*x )
7*x = 0 // : 7
x = 0
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 0}
x = 2
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