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12x+2=5x+9
We move all terms to the left:
12x+2-(5x+9)=0
We get rid of parentheses
12x-5x-9+2=0
We add all the numbers together, and all the variables
7x-7=0
We move all terms containing x to the left, all other terms to the right
7x=7
x=7/7
x=1
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