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9a-5=2a+9a
We move all terms to the left:
9a-5-(2a+9a)=0
We add all the numbers together, and all the variables
9a-(+11a)-5=0
We get rid of parentheses
9a-11a-5=0
We add all the numbers together, and all the variables
-2a-5=0
We move all terms containing a to the left, all other terms to the right
-2a=5
a=5/-2
a=-2+1/2
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