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15=a-3.8
We move all terms to the left:
15-(a-3.8)=0
We get rid of parentheses
-a+3.8+15=0
We add all the numbers together, and all the variables
-1a+18.8=0
We move all terms containing a to the left, all other terms to the right
-a=-18.8
a=-18.8/-1
a=18+0.8/1
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