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D( x )
6-(5*x) = 0
6-(5*x) = 0
6-(5*x) = 0
6-5*x = 0
6-5*x = 0 // - 6
-5*x = -6 // : -5
x = -6/(-5)
x = 6/5
x in (-oo:6/5) U (6/5:+oo)
(12-(7*x))/(6-(5*x)) = 0
(12-7*x)/(6-5*x) = 0
12-7*x = 0 // - 12
-7*x = -12 // : -7
x = -12/(-7)
x = 12/7
x = 12/7
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