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12x+5=9x+47
We move all terms to the left:
12x+5-(9x+47)=0
We get rid of parentheses
12x-9x-47+5=0
We add all the numbers together, and all the variables
3x-42=0
We move all terms containing x to the left, all other terms to the right
3x=42
x=42/3
x=14
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