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3-=21+5A
We move all terms to the left:
3--(21+5A)=0
We add all the numbers together, and all the variables
-(5A+21)+3-=0
We add all the numbers together, and all the variables
-(5A+21)=0
We get rid of parentheses
-5A-21=0
We move all terms containing A to the left, all other terms to the right
-5A=21
A=21/-5
A=-4+1/5
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