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17.58=a-2.11
We move all terms to the left:
17.58-(a-2.11)=0
We get rid of parentheses
-a+2.11+17.58=0
We add all the numbers together, and all the variables
-1a+19.69=0
We move all terms containing a to the left, all other terms to the right
-a=-19.69
a=-19.69/-1
a=19+0.69/1
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