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D( x )
7*x+5 = 0
7*x+5 = 0
7*x+5 = 0
7*x+5 = 0 // - 5
7*x = -5 // : 7
x = -5/7
x in (-oo:-5/7) U (-5/7:+oo)
6*x-8 = (8*x-1)/(7*x+5) // - (8*x-1)/(7*x+5)
6*x-((8*x-1)/(7*x+5))-8 = 0
(-1*(8*x-1))/(7*x+5)+6*x-8 = 0
(-1*(8*x-1))/(7*x+5)+(6*x*(7*x+5))/(7*x+5)+(-8*(7*x+5))/(7*x+5) = 0
6*x*(7*x+5)-1*(8*x-1)-8*(7*x+5) = 0
42*x^2+22*x-56*x-40+1 = 0
42*x^2-34*x-39 = 0
42*x^2-34*x-39 = 0
42*x^2-34*x-39 = 0
DELTA = (-34)^2-(-39*4*42)
DELTA = 7708
DELTA > 0
x = (7708^(1/2)+34)/(2*42) or x = (34-7708^(1/2))/(2*42)
x = (2*1927^(1/2)+34)/84 or x = (34-2*1927^(1/2))/84
(x-((34-2*1927^(1/2))/84))*(x-((2*1927^(1/2)+34)/84)) = 0
((x-((34-2*1927^(1/2))/84))*(x-((2*1927^(1/2)+34)/84)))/(7*x+5) = 0
((x-((34-2*1927^(1/2))/84))*(x-((2*1927^(1/2)+34)/84)))/(7*x+5) = 0 // * 7*x+5
(x-((34-2*1927^(1/2))/84))*(x-((2*1927^(1/2)+34)/84)) = 0
( x-((2*1927^(1/2)+34)/84) )
x-((2*1927^(1/2)+34)/84) = 0 // + (2*1927^(1/2)+34)/84
x = (2*1927^(1/2)+34)/84
( x-((34-2*1927^(1/2))/84) )
x-((34-2*1927^(1/2))/84) = 0 // + (34-2*1927^(1/2))/84
x = (34-2*1927^(1/2))/84
x in { (2*1927^(1/2)+34)/84, (34-2*1927^(1/2))/84 }
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