Rewrite the equation as .

Multiply both sides of the equation by .

Remove parentheses.

Multiply by .

Subtract from both sides of the equation.

Multiply each term in by

Multiply each term in by .

Multiply .

Multiply by .

Multiply by .

Simplify each term.

Move to the left of .

Rewrite as .

Multiply .

Multiply by .

Multiply by .

Rewrite the equation as .

Factor each term.

Apply the distributive property.

Multiply .

Multiply by .

Multiply by .

Subtract from .

Add and .

Reduce the expression by cancelling the common factors.

Reduce the expression by cancelling the common factors.

Cancel the common factor.

Rewrite the expression.

Divide by .

Solve in Terms of the Arbitrary Variable R I=(R-U)/S