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D( x )
7-(6*x) = 0
7-(6*x) = 0
7-(6*x) = 0
7-6*x = 0
7-6*x = 0 // - 7
-6*x = -7 // : -6
x = -7/(-6)
x = 7/6
x in (-oo:7/6) U (7/6:+oo)
(9*x)/(7-(6*x)) = 15 // - 15
(9*x)/(7-(6*x))-15 = 0
(9*x)/(7-6*x)-15 = 0
(9*x)/(7-6*x)+(-15*(7-6*x))/(7-6*x) = 0
9*x-15*(7-6*x) = 0
99*x-105 = 0
(99*x-105)/(7-6*x) = 0
(99*x-105)/(7-6*x) = 0 // * 7-6*x
99*x-105 = 0
99*x-105 = 0 // + 105
99*x = 105 // : 99
x = 105/99
x = 35/33
x = 35/33
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