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(a-9)+(a-45)=a+48
We move all terms to the left:
(a-9)+(a-45)-(a+48)=0
We get rid of parentheses
a+a-a-9-45-48=0
We add all the numbers together, and all the variables
a-102=0
We move all terms containing a to the left, all other terms to the right
a=102
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