Rewrite the equation as .
Subtract from both sides of the equation.
Factor out of .
Factor out of .
Factor out of .
Divide each term in by .
Simplify the left side of the equation by cancelling the common factors.
Cancel the common factor of .
Cancel the common factor.
Rewrite the expression.
Cancel the common factor of .
Cancel the common factor.
Divide by .
Simplify .
Simplify each term.
Cancel the common factor of and .
Factor out of .
Cancel the common factors.
Cancel the common factor.
Rewrite the expression.
Move the negative in front of the fraction.
To write as a fraction with a common denominator, multiply by .
Write each expression with a common denominator of , by multiplying each by an appropriate factor of .
Combine.
Reorder the factors of .
Combine the numerators over the common denominator.
Multiply by .
Solve for h A=2lw+2wh+2hl