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+351=-3A+9
We move all terms to the left:
+351-(-3A+9)=0
We get rid of parentheses
3A-9+351=0
We add all the numbers together, and all the variables
3A+342=0
We move all terms containing A to the left, all other terms to the right
3A=-342
A=-342/3
A=-114
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