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8-(2a+9)=a+44
We move all terms to the left:
8-(2a+9)-(a+44)=0
We get rid of parentheses
-2a-a-9-44+8=0
We add all the numbers together, and all the variables
-3a-45=0
We move all terms containing a to the left, all other terms to the right
-3a=45
a=45/-3
a=-15
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