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D( x )
x+1 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:+oo)
2*x+15 = 385/(x+1) // - 385/(x+1)
2*x-(385/(x+1))+15 = 0
2*x-385*(x+1)^-1+15 = 0
2*x-385/(x+1)+15 = 0
(2*x*(x+1))/(x+1)-385/(x+1)+(15*(x+1))/(x+1) = 0
2*x*(x+1)+15*(x+1)-385 = 0
2*x^2+2*x+15*x-385+15 = 0
2*x^2+17*x-370 = 0
2*x^2+17*x-370 = 0
2*x^2+17*x-370 = 0
DELTA = 17^2-(-370*2*4)
DELTA = 3249
DELTA > 0
x = (3249^(1/2)-17)/(2*2) or x = (-3249^(1/2)-17)/(2*2)
x = 10 or x = -37/2
(x+37/2)*(x-10) = 0
((x+37/2)*(x-10))/(x+1) = 0
((x+37/2)*(x-10))/(x+1) = 0 // * x+1
(x+37/2)*(x-10) = 0
( x+37/2 )
x+37/2 = 0 // - 37/2
x = -37/2
( x-10 )
x-10 = 0 // + 10
x = 10
x in { -37/2, 10 }
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