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2a-45=3a-78
We move all terms to the left:
2a-45-(3a-78)=0
We get rid of parentheses
2a-3a+78-45=0
We add all the numbers together, and all the variables
-1a+33=0
We move all terms containing a to the left, all other terms to the right
-a=-33
a=-33/-1
a=+33
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