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D( x )
2*x+7 = 0
2*x+7 = 0
2*x+7 = 0
2*x+7 = 0 // - 7
2*x = -7 // : 2
x = -7/2
x in (-oo:-7/2) U (-7/2:+oo)
(9*x-1)/(2*x+7) = 0
9*x-1 = 0 // + 1
9*x = 1 // : 9
x = 1/9
x = 1/9
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