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D( x )
x-7 = 0
x+2 = 0
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:7) U (7:+oo)
(7*x+14)/(x-7) = (2*x)/(x+2) // - (2*x)/(x+2)
(7*x+14)/(x-7)-((2*x)/(x+2)) = 0
(7*x+14)/(x-7)-2*x*(x+2)^-1 = 0
(7*x+14)/(x-7)+(-2*x)/(x+2) = 0
((7*x+14)*(x+2))/((x-7)*(x+2))+(-2*x*(x-7))/((x-7)*(x+2)) = 0
(7*x+14)*(x+2)-2*x*(x-7) = 0
5*x^2+42*x+28 = 0
5*x^2+42*x+28 = 0
5*x^2+42*x+28 = 0
DELTA = 42^2-(4*5*28)
DELTA = 1204
DELTA > 0
x = (1204^(1/2)-42)/(2*5) or x = (-1204^(1/2)-42)/(2*5)
x = (2*301^(1/2)-42)/10 or x = (-2*301^(1/2)-42)/10
(x-((-2*301^(1/2)-42)/10))*(x-((2*301^(1/2)-42)/10)) = 0
((x-((-2*301^(1/2)-42)/10))*(x-((2*301^(1/2)-42)/10)))/((x-7)*(x+2)) = 0
((x-((-2*301^(1/2)-42)/10))*(x-((2*301^(1/2)-42)/10)))/((x-7)*(x+2)) = 0 // * (x-7)*(x+2)
(x-((-2*301^(1/2)-42)/10))*(x-((2*301^(1/2)-42)/10)) = 0
( x-((-2*301^(1/2)-42)/10) )
x-((-2*301^(1/2)-42)/10) = 0 // + (-2*301^(1/2)-42)/10
x = (-2*301^(1/2)-42)/10
( x-((2*301^(1/2)-42)/10) )
x-((2*301^(1/2)-42)/10) = 0 // + (2*301^(1/2)-42)/10
x = (2*301^(1/2)-42)/10
x in { (-2*301^(1/2)-42)/10, (2*301^(1/2)-42)/10 }
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