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6a+2a-2a+6-a-1=40
We move all terms to the left:
6a+2a-2a+6-a-1-(40)=0
We add all the numbers together, and all the variables
5a-35=0
We move all terms containing a to the left, all other terms to the right
5a=35
a=35/5
a=7
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