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50=1a+8
We move all terms to the left:
50-(1a+8)=0
We add all the numbers together, and all the variables
-(a+8)+50=0
We get rid of parentheses
-a-8+50=0
We add all the numbers together, and all the variables
-1a+42=0
We move all terms containing a to the left, all other terms to the right
-a=-42
a=-42/-1
a=+42
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