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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
(5*x+7)/(3*x)-((2*x-2)/(3*x)) = 0
(5*x+7)/(3*x)+(-1*(2*x-2))/(3*x) = 0
5*x-1*(2*x-2)+7 = 0
3*x+9 = 0
(3*x+9)/(3*x) = 0
(3*x+9)/(3*x) = 0 // * 3*x
3*x+9 = 0
3*x+9 = 0 // - 9
3*x = -9 // : 3
x = -9/3
x = -3
x = -3
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