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3a+66=129+30
We move all terms to the left:
3a+66-(129+30)=0
We add all the numbers together, and all the variables
3a+66-159=0
We add all the numbers together, and all the variables
3a-93=0
We move all terms containing a to the left, all other terms to the right
3a=93
a=93/3
a=31
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