Move all terms containing z to the left side of the equation.
Subtract z from both sides of the equation.
Subtract z from -9z.
Divide each term by -10 and simplify.
Divide each term in -10z=20 by -10.
Cancel the common factor of -10.
Cancel the common factor.
Divide z by 1.
Divide 20 by -10.
Solve for z -9z=20+z