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23=5-9a
We move all terms to the left:
23-(5-9a)=0
We add all the numbers together, and all the variables
-(-9a+5)+23=0
We get rid of parentheses
9a-5+23=0
We add all the numbers together, and all the variables
9a+18=0
We move all terms containing a to the left, all other terms to the right
9a=-18
a=-18/9
a=-2
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