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13=a-5.3
We move all terms to the left:
13-(a-5.3)=0
We get rid of parentheses
-a+5.3+13=0
We add all the numbers together, and all the variables
-1a+18.3=0
We move all terms containing a to the left, all other terms to the right
-a=-18.3
a=-18.3/-1
a=18+0.3/1
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