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D( x )
3*x+1 = 0
3*x+1 = 0
3*x+1 = 0
3*x+1 = 0 // - 1
3*x = -1 // : 3
x = -1/3
x in (-oo:-1/3) U (-1/3:+oo)
(2*x+17)/(3*x+1) = 3/4 // - 3/4
(2*x+17)/(3*x+1)-(3/4) = 0
(2*x+17)/(3*x+1)-3/4 = 0
(4*(2*x+17))/(4*(3*x+1))+(-3*(3*x+1))/(4*(3*x+1)) = 0
4*(2*x+17)-3*(3*x+1) = 0
65-x = 0
(65-x)/(4*(3*x+1)) = 0
(65-x)/(4*(3*x+1)) = 0 // * 4*(3*x+1)
65-x = 0
65-x = 0 // - 65
-x = -65 // * -1
x = 65
x = 65
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