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D( x )
7-(4*x) = 0
7-(4*x) = 0
7-(4*x) = 0
7-4*x = 0
7-4*x = 0 // - 7
-4*x = -7 // : -4
x = -7/(-4)
x = 7/4
x in (-oo:7/4) U (7/4:+oo)
y = (5-(3*x))/(7-(4*x)) // - (5-(3*x))/(7-(4*x))
y-((5-(3*x))/(7-(4*x))) = 0
y-((5-3*x)/(7-4*x)) = 0
(-1*(5-3*x))/(7-4*x)+y = 0
(-1*(5-3*x))/(7-4*x)+(y*(7-4*x))/(7-4*x) = 0
y*(7-4*x)-1*(5-3*x) = 0
3*x-4*x*y+7*y-5 = 0
(3*x-4*x*y+7*y-5)/(7-4*x) = 0
(3*x-4*x*y+7*y-5)/(7-4*x) = 0 // * 7-4*x
3*x-4*x*y+7*y-5 = 0
7*y-4*x*y-5 = 0 // - 7*y-5
-4*x*y = -(7*y-5) // : -4*y
x = (-(7*y-5))/(-4*y)
x = (5-(7*y))/(-4*y)
x = (5-(7*y))/(-4*y)
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