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7=3+a
We move all terms to the left:
7-(3+a)=0
We add all the numbers together, and all the variables
-(a+3)+7=0
We get rid of parentheses
-a-3+7=0
We add all the numbers together, and all the variables
-1a+4=0
We move all terms containing a to the left, all other terms to the right
-a=-4
a=-4/-1
a=+4
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