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D( x )
3*x+18 = 0
3*x+18 = 0
3*x+18 = 0
3*x+18 = 0 // - 18
3*x = -18 // : 3
x = -18/3
x = -6
x in (-oo:-6) U (-6:+oo)
(2*x+5*x+4*x+10+16)/(3*x+18) = 3 // - 3
(2*x+5*x+4*x+10+16)/(3*x+18)-3 = 0
(11*x+26)/(3*x+18)-3 = 0
(11*x+26)/(3*x+18)+(-3*(3*x+18))/(3*x+18) = 0
11*x-3*(3*x+18)+26 = 0
2*x-28 = 0
(2*x-28)/(3*x+18) = 0
(2*x-28)/(3*x+18) = 0 // * 3*x+18
2*x-28 = 0
2*x-28 = 0 // + 28
2*x = 28 // : 2
x = 28/2
x = 14
x = 14
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