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D( x )
((-8*x-9)^1)/2 = 0
((-8*x-9)^1)/2 = 0
((-8*x-9)^1)/2 = 0
(-8*x-9)/2 = 0
-8*x-9 = 0 // + 9
-8*x = 9 // : -8
x = 9/(-8)
x = -9/8
x in (-oo:-9/8) U (-9/8:+oo)
y = 7/(((-8*x-9)^1)/2) // - 7/(((-8*x-9)^1)/2)
y-(7/(((-8*x-9)^1)/2)) = 0
y-14*(-8*x-9)^-1 = 0
y-14/(-8*x-9) = 0
(y*(-8*x-9))/(-8*x-9)-14/(-8*x-9) = 0
y*(-8*x-9)-14 = 0
-8*x*y-9*y-14 = 0
(-8*x*y-9*y-14)/(-8*x-9) = 0
(-8*x*y-9*y-14)/(-8*x-9) = 0 // * -8*x-9
-8*x*y-9*y-14 = 0
-8*x*y-9*y-14 = 0 // + -9*y-14
-8*x*y = -(-9*y-14) // : -8*y
x = (-(-9*y-14))/(-8*y)
x = (14-(-9*y))/(-8*y)
x = (14-(-9*y))/(-8*y)
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