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27-11=2a+2-9a
We move all terms to the left:
27-11-(2a+2-9a)=0
We add all the numbers together, and all the variables
-(-7a+2)+27-11=0
We add all the numbers together, and all the variables
-(-7a+2)+16=0
We get rid of parentheses
7a-2+16=0
We add all the numbers together, and all the variables
7a+14=0
We move all terms containing a to the left, all other terms to the right
7a=-14
a=-14/7
a=-2
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