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+42=3A+10
We move all terms to the left:
+42-(3A+10)=0
We get rid of parentheses
-3A-10+42=0
We add all the numbers together, and all the variables
-3A+32=0
We move all terms containing A to the left, all other terms to the right
-3A=-32
A=-32/-3
A=10+2/3
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