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4a-17=2a+23
We move all terms to the left:
4a-17-(2a+23)=0
We get rid of parentheses
4a-2a-23-17=0
We add all the numbers together, and all the variables
2a-40=0
We move all terms containing a to the left, all other terms to the right
2a=40
a=40/2
a=20
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