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D( x )
4*x+4 = 0
4*x+4 = 0
4*x+4 = 0
4*x+4 = 0 // - 4
4*x = -4 // : 4
x = -4/4
x = -1
x in (-oo:-1) U (-1:+oo)
(4*x-10)/(4*x+4) = 2/3 // - 2/3
(4*x-10)/(4*x+4)-(2/3) = 0
(4*x-10)/(4*x+4)-2/3 = 0
(3*(4*x-10))/(3*(4*x+4))+(-2*(4*x+4))/(3*(4*x+4)) = 0
3*(4*x-10)-2*(4*x+4) = 0
4*x-38 = 0
(4*x-38)/(3*(4*x+4)) = 0
(4*x-38)/(3*(4*x+4)) = 0 // * 3*(4*x+4)
4*x-38 = 0
4*x-38 = 0 // + 38
4*x = 38 // : 4
x = 38/4
x = 19/2
x = 19/2
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