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19=a/20-8
We move all terms to the left:
19-(a/20-8)=0
We get rid of parentheses
-a/20+8+19=0
We multiply all the terms by the denominator
-a+8*20+19*20=0
We add all the numbers together, and all the variables
-1a+540=0
We move all terms containing a to the left, all other terms to the right
-a=-540
a=-540/-1
a=+540
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