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2a+a=31-1
We move all terms to the left:
2a+a-(31-1)=0
We add all the numbers together, and all the variables
2a+a-30=0
We add all the numbers together, and all the variables
3a-30=0
We move all terms containing a to the left, all other terms to the right
3a=30
a=30/3
a=10
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