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D( x )
-6*x-7 = 0
-6*x-7 = 0
-6*x-7 = 0
-6*x-7 = 0 // + 7
-6*x = 7 // : -6
x = 7/(-6)
x = -7/6
x in (-oo:-7/6) U (-7/6:+oo)
(9*x-8)/(-6*x-7) = 0
9*x-8 = 0 // + 8
9*x = 8 // : 9
x = 8/9
x = 8/9
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