Question 517039
x+21/x=-10
x^2+21+10x=0
x^2+10x+21=0
(x+7)*(x+3)=0
x=-7
x=-3

check -3
-3+21/-3=-10
-3-7=-10
-10=-10
ok
check -7
-7+21/-7=-10
-7-3=-10
-10=-10
ok