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+8=A+A
We move all terms to the left:
+8-(A+A)=0
We add all the numbers together, and all the variables
-(+2A)+8=0
We get rid of parentheses
-2A+8=0
We move all terms containing A to the left, all other terms to the right
-2A=-8
A=-8/-2
A=+4
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