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D( x )
3*x-3 = 0
3*x-3 = 0
3*x-3 = 0
3*x-3 = 0 // + 3
3*x = 3 // : 3
x = 3/3
x = 1
x in (-oo:1) U (1:+oo)
(4*x-7)/(3*x-3) = 6/5 // - 6/5
(4*x-7)/(3*x-3)-(6/5) = 0
(4*x-7)/(3*x-3)-6/5 = 0
(5*(4*x-7))/(5*(3*x-3))+(-6*(3*x-3))/(5*(3*x-3)) = 0
5*(4*x-7)-6*(3*x-3) = 0
2*x-17 = 0
(2*x-17)/(5*(3*x-3)) = 0
(2*x-17)/(5*(3*x-3)) = 0 // * 5*(3*x-3)
2*x-17 = 0
2*x-17 = 0 // + 17
2*x = 17 // : 2
x = 17/2
x = 17/2
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