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19.63-200.8=a
We move all terms to the left:
19.63-200.8-(a)=0
We add all the numbers together, and all the variables
-1a-181.17=0
We move all terms containing a to the left, all other terms to the right
-a=181.17
a=181.17/-1
a=-181+0.16999999999999/1
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