Solve for a 7=40-a

7=40-a

Rewrite the equation as 40-a=7.

40-a=7

Move all terms not containing a to the right side of the equation.

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Subtract 40 from both sides of the equation.

-a=7-40

Subtract 40 from 7.

-a=-33

Multiply each term in -a=-33 by -1

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Multiply each term in -a=-33 by -1.

(-a)⋅-1=(-33)⋅-1

Multiply (-a)⋅-1.

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Multiply -1 by -1.

1a=(-33)⋅-1

Multiply a by 1.

a=(-33)⋅-1

Multiply -33 by -1.

a=33

Solve for a 7=40-a