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(a-250)5=1355
We move all terms to the left:
(a-250)5-(1355)=0
We multiply parentheses
5a-1250-1355=0
We add all the numbers together, and all the variables
5a-2605=0
We move all terms containing a to the left, all other terms to the right
5a=2605
a=2605/5
a=521
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