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100/2=a+5
We move all terms to the left:
100/2-(a+5)=0
We add all the numbers together, and all the variables
-(a+5)+50=0
We get rid of parentheses
-a-5+50=0
We add all the numbers together, and all the variables
-1a+45=0
We move all terms containing a to the left, all other terms to the right
-a=-45
a=-45/-1
a=+45
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