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D( x )
3*x-7 = 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:+oo)
2-(5/(3*x-7)) = 2 // - 2
2-(5/(3*x-7))-2 = 0
2-5*(3*x-7)^-1-2 = 0
2-5/(3*x-7)-2 = 0
(-2*(3*x-7))/(3*x-7)-5/(3*x-7)+(2*(3*x-7))/(3*x-7) = 0
2*(3*x-7)-2*(3*x-7)-5 = 0
6*x-6*x-14+9 = 0
-5 = 0
-5/(3*x-7) = 0
-5/(3*x-7) = 0 // * 3*x-7
-5 = 0
-5 = 0
x belongs to the empty set
x belongs to the empty set
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