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15a-23=31+6a
We move all terms to the left:
15a-23-(31+6a)=0
We add all the numbers together, and all the variables
15a-(6a+31)-23=0
We get rid of parentheses
15a-6a-31-23=0
We add all the numbers together, and all the variables
9a-54=0
We move all terms containing a to the left, all other terms to the right
9a=54
a=54/9
a=6
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