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12=909-2x
We move all terms to the left:
12-(909-2x)=0
We add all the numbers together, and all the variables
-(-2x+909)+12=0
We get rid of parentheses
2x-909+12=0
We add all the numbers together, and all the variables
2x-897=0
We move all terms containing x to the left, all other terms to the right
2x=897
x=897/2
x=448+1/2
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