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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 in (-oo:-7/6) U (-7/6:+oo)
(5*x+5)/(6*x+7) = 0
5*x+5 = 0 // - 5
5*x = -5 // : 5
x = -5/5
x = -1
x = -1
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