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11=a-5.5
We move all terms to the left:
11-(a-5.5)=0
We get rid of parentheses
-a+5.5+11=0
We add all the numbers together, and all the variables
-1a+16.5=0
We move all terms containing a to the left, all other terms to the right
-a=-16.5
a=-16.5/-1
a=16+0.5/1
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