4a+7-2a-9=12

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Solution for 4a+7-2a-9=12 equation: 



4a+7-2a-9=12

We move all terms to the left:

4a+7-2a-9-(12)=0

We add all the numbers together, and all the variables

2a-14=0

We move all terms containing a to the left, all other terms to the right

2a=14

a=14/2

a=7

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