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D( x )
x = 0
4*x = 0
x = 0
x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
7/8-(9/(4*x)) = (x-2)/x // - (x-2)/x
7/8-((x-2)/x)-(9/(4*x)) = 0
(-9/4)*x^-1-((x-2)/x)+7/8 = 0
(-1*(x-2))/x-9/(4*x)+7/8 = 0
(-1*4*8*x*(x-2))/(4*8*x*x)+(-9*8*x)/(4*8*x*x)+(4*7*x*x)/(4*8*x*x) = 0
4*7*x*x-1*4*8*x*(x-2)-9*8*x = 0
28*x^2-32*x^2-8*x = 0
-4*x^2-8*x = 0
-4*x^2-8*x = 0
-4*x*(x+2) = 0
x+2 = 0 // - 2
x = -2
-4*x*(x+2) = 0
(-4*x*(x+2))/(4*8*x*x) = 0
(-4*x*(x+2))/(4*8*x*x) = 0 // * 4*8*x*x
-4*x*(x+2) = 0
( -4*x )
-4*x = 0 // : -4
x = 0
( x+2 )
x+2 = 0 // - 2
x = -2
x in { 0}
x = -2
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