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3a+7a=12-2
We move all terms to the left:
3a+7a-(12-2)=0
We add all the numbers together, and all the variables
3a+7a-10=0
We add all the numbers together, and all the variables
10a-10=0
We move all terms containing a to the left, all other terms to the right
10a=10
a=10/10
a=1
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