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11x+12=9x+28
We move all terms to the left:
11x+12-(9x+28)=0
We get rid of parentheses
11x-9x-28+12=0
We add all the numbers together, and all the variables
2x-16=0
We move all terms containing x to the left, all other terms to the right
2x=16
x=16/2
x=8
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