Rewrite the equation as .

Subtract from both sides of the equation.

Subtract from .

Multiply each term in by .

Multiply .

Multiply by .

Multiply by .

Multiply by .

Solve for a 7=40-a

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# Solve for a 7=40-a

Rewrite the equation as .

Subtract from both sides of the equation.

Subtract from .

Multiply each term in by .

Multiply .

Multiply by .

Multiply by .

Multiply by .

Solve for a 7=40-a