11x+9-16x=-21
Simplify both sides of the equation
Combine like terms
(11x+-16x)+(9)=-21
-5x+9=-21
Subtract 9 from both sides
-5x+9-9=-21-9
-5x=-30
Divide both sides by -5
-5x/-5=-30/5
x=6
I hope that's help !
