Solve for a 6a-9=12+3a

Math
6a-9=12+3a
Move all terms containing a to the left side of the equation.
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Subtract 3a from both sides of the equation.
6a-9-3a=12
Subtract 3a from 6a.
3a-9=12
3a-9=12
Move all terms not containing a to the right side of the equation.
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Add 9 to both sides of the equation.
3a=12+9
Add 12 and 9.
3a=21
3a=21
Divide each term by 3 and simplify.
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Divide each term in 3a=21 by 3.
3a3=213
Cancel the common factor of 3.
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Cancel the common factor.
3a3=213
Divide a by 1.
a=213
a=213
Divide 21 by 3.
a=7
a=7
Solve for a 6a-9=12+3a

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