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50=a+a+8
We move all terms to the left:
50-(a+a+8)=0
We add all the numbers together, and all the variables
-(2a+8)+50=0
We get rid of parentheses
-2a-8+50=0
We add all the numbers together, and all the variables
-2a+42=0
We move all terms containing a to the left, all other terms to the right
-2a=-42
a=-42/-2
a=+21
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