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D( u )
u+5 = 0
u+5 = 0
u+5 = 0
u+5 = 0 // - 5
u = -5
u in (-oo:-5) U (-5:+oo)
-7 = 6/(u+5) // - 6/(u+5)
-(6/(u+5))-7 = 0
-6*(u+5)^-1-7 = 0
-6/(u+5)-7 = 0
(-7*(u+5))/(u+5)-6/(u+5) = 0
-7*(u+5)-6 = 0
-7*u-41 = 0
(-7*u-41)/(u+5) = 0
(-7*u-41)/(u+5) = 0 // * u+5
-7*u-41 = 0
-7*u-41 = 0 // + 41
-7*u = 41 // : -7
u = 41/(-7)
u = -41/7
u = -41/7
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