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D( x )
7*x+22 = 0
7*x+22 = 0
7*x+22 = 0
7*x+22 = 0 // - 22
7*x = -22 // : 7
x = -22/7
x in (-oo:-22/7) U (-22/7:+oo)
(2*x+5)/(7*x+22) = 0
2*x+5 = 0 // - 5
2*x = -5 // : 2
x = -5/2
x = -5/2
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