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8a+9a-161=-6a
We move all terms to the left:
8a+9a-161-(-6a)=0
We add all the numbers together, and all the variables
17a-(-6a)-161=0
We get rid of parentheses
17a+6a-161=0
We add all the numbers together, and all the variables
23a-161=0
We move all terms containing a to the left, all other terms to the right
23a=161
a=161/23
a=7
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