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D( b )
b+5 = 0
b+5 = 0
b+5 = 0
b+5 = 0 // - 5
b = -5
b in (-oo:-5) U (-5:+oo)
7/(b+5) = 10/5 // - 10/5
7/(b+5)-(10/5) = 0
7/(b+5)-2 = 0
7/(b+5)+(-2*(b+5))/(b+5) = 0
7-2*(b+5) = 0
-2*b-3 = 0
(-2*b-3)/(b+5) = 0
(-2*b-3)/(b+5) = 0 // * b+5
-2*b-3 = 0
-2*b-3 = 0 // + 3
-2*b = 3 // : -2
b = 3/(-2)
b = -3/2
b = -3/2
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