Rewrite the equation as .
Multiply both sides of the equation by .
Simplify the left side.
Cancel the common factor of .
Cancel the common factor.
Rewrite the expression.
Cancel the common factor of .
Cancel the common factor.
Rewrite the expression.
Multiply by .
Simplify .
Cancel the common factor of .
Factor out of .
Cancel the common factor.
Rewrite the expression.
Multiply by .
Add to both sides of the equation.
Add and .
Solve for f 40=5/9(f-32)