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-23=-2a-10+
We move all terms to the left:
-23-(-2a-10+)=0
We add all the numbers together, and all the variables
-(-2a)-23=0
We get rid of parentheses
2a-23=0
We move all terms containing a to the left, all other terms to the right
2a=23
a=23/2
a=11+1/2
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