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28/7+5=a-2
We move all terms to the left:
28/7+5-(a-2)=0
We add all the numbers together, and all the variables
-(a-2)+9=0
We get rid of parentheses
-a+2+9=0
We add all the numbers together, and all the variables
-1a+11=0
We move all terms containing a to the left, all other terms to the right
-a=-11
a=-11/-1
a=+11
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