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85a=80+65a
We move all terms to the left:
85a-(80+65a)=0
We add all the numbers together, and all the variables
85a-(65a+80)=0
We get rid of parentheses
85a-65a-80=0
We add all the numbers together, and all the variables
20a-80=0
We move all terms containing a to the left, all other terms to the right
20a=80
a=80/20
a=4
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