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D( x )
x+2 = 0
x = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x = 0
x = 0
x in (-oo:-2) U (-2:0) U (0:+oo)
7/x-1+2 = (5*x+18)/(x+2) // - (5*x+18)/(x+2)
7/x-((5*x+18)/(x+2))-1+2 = 0
(-1*(5*x+18))/(x+2)+7/x-1+2 = 0
(-1*x*(5*x+18))/(x*(x+2))+(7*(x+2))/(x*(x+2))+(-1*x*(x+2))/(x*(x+2))+(2*x*(x+2))/(x*(x+2)) = 0
7*(x+2)-1*x*(5*x+18)-1*x*(x+2)+2*x*(x+2) = 0
2*x^2-5*x^2-x^2-11*x-2*x+4*x+14 = 0
2*x^2-6*x^2-13*x+4*x+14 = 0
14-4*x^2-9*x = 0
14-4*x^2-9*x = 0
14-4*x^2-9*x = 0
DELTA = (-9)^2-(-4*4*14)
DELTA = 305
DELTA > 0
x = (305^(1/2)+9)/(-4*2) or x = (9-305^(1/2))/(-4*2)
x = (305^(1/2)+9)/(-8) or x = (9-305^(1/2))/(-8)
(x-((305^(1/2)+9)/(-8)))*(x-((9-305^(1/2))/(-8))) = 0
((x-((305^(1/2)+9)/(-8)))*(x-((9-305^(1/2))/(-8))))/(x*(x+2)) = 0
((x-((305^(1/2)+9)/(-8)))*(x-((9-305^(1/2))/(-8))))/(x*(x+2)) = 0 // * x*(x+2)
(x-((305^(1/2)+9)/(-8)))*(x-((9-305^(1/2))/(-8))) = 0
( x-((305^(1/2)+9)/(-8)) )
x-((305^(1/2)+9)/(-8)) = 0 // + (305^(1/2)+9)/(-8)
x = (305^(1/2)+9)/(-8)
( x-((9-305^(1/2))/(-8)) )
x-((9-305^(1/2))/(-8)) = 0 // + (9-305^(1/2))/(-8)
x = (9-305^(1/2))/(-8)
x in { (305^(1/2)+9)/(-8), (9-305^(1/2))/(-8) }
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