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D( x )
7*x+63 = 0
3*x+27 = 0
7*x+63 = 0
7*x+63 = 0
7*x+63 = 0 // - 63
7*x = -63 // : 7
x = -63/7
x = -9
3*x+27 = 0
3*x+27 = 0
3*x+27 = 0 // - 27
3*x = -27 // : 3
x = -27/3
x = -9
x in (-oo:-9) U (-9:+oo)
(x-8)/(3*x+27)-((x+5)/(7*x+63)) = 0
(x-8)/(3*x+27)+(-1*(x+5))/(7*x+63) = 0
((x-8)*(7*x+63))/((3*x+27)*(7*x+63))+(-1*(x+5)*(3*x+27))/((3*x+27)*(7*x+63)) = 0
(x-8)*(7*x+63)-1*(x+5)*(3*x+27) = 0
4*x^2-35*x-639 = 0
4*x^2-35*x-639 = 0
4*x^2-35*x-639 = 0
DELTA = (-35)^2-(-639*4*4)
DELTA = 11449
DELTA > 0
x = (11449^(1/2)+35)/(2*4) or x = (35-11449^(1/2))/(2*4)
x = 71/4 or x = -9
(x+9)*(x-71/4) = 0
((x+9)*(x-71/4))/((3*x+27)*(7*x+63)) = 0
((x+9)*(x-71/4))/((3*x+27)*(7*x+63)) = 0 // * (3*x+27)*(7*x+63)
(x+9)*(x-71/4) = 0
( x+9 )
x+9 = 0 // - 9
x = -9
( x-71/4 )
x-71/4 = 0 // + 71/4
x = 71/4
x in { -9}
x = 71/4
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