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(1/10)*(x-1) = x*(((2/5)*(x+7)^1)/5) // - x*(((2/5)*(x+7)^1)/5)
(1/10)*(x-1)-(x*(((2/5)*(x+7)^1)/5)) = 0
(1/10)*(x-1)+(-2/25)*x*(x+7) = 0
1/10*(x-1)-2/25*x*(x+7) = 0
1/10*(x-1)-2/25*x*(x+7) = 0
-2/25*x^2-23/50*x-1/10 = 0
-2/25*x^2-23/50*x-1/10 = 0
-1/5*(2/5*x^2+23/10*x+1/2) = 0
2/5*x^2+23/10*x+1/2 = 0
DELTA = (23/10)^2-(2/5*1/2*4)
DELTA = 449/100
DELTA > 0
x = ((449/100)^(1/2)-23/10)/(2/5*2) or x = (-(449/100)^(1/2)-23/10)/(2/5*2)
x = 5/4*((449/100)^(1/2)-23/10) or x = -5/4*((449/100)^(1/2)+23/10)
-1/5*(x+5/4*((449/100)^(1/2)+23/10))*(x-5/4*((449/100)^(1/2)-23/10)) = 0
-1/5*(x+5/4*((449/100)^(1/2)+23/10))*(x-5/4*((449/100)^(1/2)-23/10)) = 0
( x+5/4*((449/100)^(1/2)+23/10) )
x+5/4*((449/100)^(1/2)+23/10) = 0 // - 5/4*((449/100)^(1/2)+23/10)
x = -(5/4*((449/100)^(1/2)+23/10))
x = -5/4*((449/100)^(1/2)+23/10)
( x-5/4*((449/100)^(1/2)-23/10) )
x-5/4*((449/100)^(1/2)-23/10) = 0 // + -5/4*((449/100)^(1/2)-23/10)
x = -(-5/4*((449/100)^(1/2)-23/10))
x = 5/4*((449/100)^(1/2)-23/10)
x in { -5/4*((449/100)^(1/2)+23/10), 5/4*((449/100)^(1/2)-23/10) }
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