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2-(1+2)=A
We move all terms to the left:
2-(1+2)-(A)=0
We add all the numbers together, and all the variables
-A+2-3=0
We add all the numbers together, and all the variables
-1A-1=0
We move all terms containing A to the left, all other terms to the right
-A=1
A=1/-1
A=-1
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