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23=6a-15
We move all terms to the left:
23-(6a-15)=0
We get rid of parentheses
-6a+15+23=0
We add all the numbers together, and all the variables
-6a+38=0
We move all terms containing a to the left, all other terms to the right
-6a=-38
a=-38/-6
a=6+1/3
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