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D( x )
x = 0
3*x+7 = 0
x = 0
x = 0
3*x+7 = 0
3*x+7 = 0
3*x+7 = 0 // - 7
3*x = -7 // : 3
x = -7/3
x in (-oo:-7/3) U (-7/3:0) U (0:+oo)
(5-(6*x))/(3*x+7) = (2*(1-x))/x // - (2*(1-x))/x
(5-(6*x))/(3*x+7)-((2*(1-x))/x) = 0
(5-6*x)/(3*x+7)-2*x^-1*(1-x) = 0
(5-6*x)/(3*x+7)+(-2*x^-1*(1-x)*(3*x+7))/(3*x+7) = 0
5-2*x^-1*(1-x)*(3*x+7)-6*x = 0
13-14*x^-1 = 0
(13-14*x^-1)/(3*x+7) = 0
(13-14*x^-1)/(3*x+7) = 0 // * 3*x+7
13-14*x^-1 = 0
-14*x^-1 = -13 // : -14
x^-1 = 13/14
-1 < 0
1/(x^1) = 13/14 // * x^1
1 = 13/14*x^1 // : 13/14
14/13 = x^1
x = 14/13
x = 14/13
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