Move all terms containing n to the left side of the equation.
Subtract 13n from both sides of the equation.
Subtract 13n from 20n.
Move all terms not containing n to the right side of the equation.
Subtract 7 from both sides of the equation.
Subtract 7 from 28.
Divide each term by 7 and simplify.
Divide each term in 7n=21 by 7.
Cancel the common factor of 7.
Cancel the common factor.
Divide n by 1.
Divide 21 by 7.
Solve for n 20n+7=13n+28