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191=38-a
We move all terms to the left:
191-(38-a)=0
We add all the numbers together, and all the variables
-(-1a+38)+191=0
We get rid of parentheses
1a-38+191=0
We add all the numbers together, and all the variables
a+153=0
We move all terms containing a to the left, all other terms to the right
a=-153
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