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D( x )
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
x in (-oo:-1/2) U (-1/2:+oo)
(7/9)*y = (2*x+1)/(2*x+1) // - (2*x+1)/(2*x+1)
(7/9)*y-((2*x+1)/(2*x+1)) = 0
(7/9)*y-1 = 0
7/9*y-1 = 0
x naleu017Cy do R
x in (-oo:-1/2) U (-1/2:+oo)
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