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53.8=a-15.9
We move all terms to the left:
53.8-(a-15.9)=0
We get rid of parentheses
-a+15.9+53.8=0
We add all the numbers together, and all the variables
-1a+69.7=0
We move all terms containing a to the left, all other terms to the right
-a=-69.7
a=-69.7/-1
a=69+0.7/1
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