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D( y )
4*y+20 = 0
y+5 = 0
4*y+20 = 0
4*y+20 = 0
4*y+20 = 0 // - 20
4*y = -20 // : 4
y = -20/4
y = -5
y+5 = 0
y+5 = 0
y+5 = 0 // - 5
y = -5
y in (-oo:-5) U (-5:+oo)
-3/(y+5) = 2-(7/(4*y+20)) // - 2-(7/(4*y+20))
7/(4*y+20)-3/(y+5)-2 = 0
(-3*(4*y+20))/((y+5)*(4*y+20))+(7*(y+5))/((y+5)*(4*y+20))+(-2*(y+5)*(4*y+20))/((y+5)*(4*y+20)) = 0
7*(y+5)-3*(4*y+20)-2*(y+5)*(4*y+20) = 0
-8*y^2-5*y-80*y-200-25 = 0
-8*y^2-85*y-225 = 0
-8*y^2-85*y-225 = 0
-1*(8*y^2+85*y+225) = 0
8*y^2+85*y+225 = 0
DELTA = 85^2-(4*8*225)
DELTA = 25
DELTA > 0
y = (25^(1/2)-85)/(2*8) or y = (-25^(1/2)-85)/(2*8)
y = -5 or y = -45/8
-1*(y+45/8)*(y+5) = 0
(-1*(y+45/8)*(y+5))/((y+5)*(4*y+20)) = 0
(-1*(y+45/8)*(y+5))/((y+5)*(4*y+20)) = 0 // * (y+5)*(4*y+20)
-1*(y+45/8)*(y+5) = 0
( y+45/8 )
y+45/8 = 0 // - 45/8
y = -45/8
( y+5 )
y+5 = 0 // - 5
y = -5
y in { -5}
y = -45/8
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