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D( x )
4*x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
(9*x-(7*y))/(4*x)-((6*x+11*y)/(4*x)) = 0
(9*x-7*y)/(4*x)-((6*x+11*y)/(4*x)) = 0
(-1*(6*x+11*y))/(4*x)+(9*x-7*y)/(4*x) = 0
9*x-1*(6*x+11*y)-7*y = 0
3*x-18*y = 0
(3*x-18*y)/(4*x) = 0
(3*x-18*y)/(4*x) = 0 // * 4*x
3*x-18*y = 0
3*x-18*y = 0 // + -18*y
3*x = -(-18*y) // : 3
x = (-(-18*y))/3
x = 6*y
x = 6*y
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