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D( x )
9-(7*x) = 0
9-(7*x) = 0
9-(7*x) = 0
9-7*x = 0
9-7*x = 0 // - 9
-7*x = -9 // : -7
x = -9/(-7)
x = 9/7
x in (-oo:9/7) U (9/7:+oo)
y = (5*x+1)/(9-(7*x)) // - (5*x+1)/(9-(7*x))
y-((5*x+1)/(9-(7*x))) = 0
y-((5*x+1)/(9-7*x)) = 0
(-1*(5*x+1))/(9-7*x)+y = 0
(-1*(5*x+1))/(9-7*x)+(y*(9-7*x))/(9-7*x) = 0
y*(9-7*x)-1*(5*x+1) = 0
9*y-5*x-7*x*y-1 = 0
(9*y-5*x-7*x*y-1)/(9-7*x) = 0
(9*y-5*x-7*x*y-1)/(9-7*x) = 0 // * 9-7*x
9*y-5*x-7*x*y-1 = 0
9*y-7*x*y-1 = 0 // - 9*y-1
-7*x*y = -(9*y-1) // : -7*y
x = (-(9*y-1))/(-7*y)
x = (1-(9*y))/(-7*y)
x = (1-(9*y))/(-7*y)
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