Solve for a 7=40-a

Math
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
-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
a=(-33)⋅-1
Multiply -33 by -1.
a=33
a=33
Solve for a 7=40-a

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