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D( x )
7*(a+b) = 0
5*x = 0
7*(a+b) = 0
7*(a+b) = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
(50*((a+b)/(5*x)))/(7*(a+b)) = 0
(50*(a+b))/(5*7*x*(a+b)) = 0
50/(5*7*x) = 0
x belongs to the empty set
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