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9(x-11)-12=28x-339
We move all terms to the left:
9(x-11)-12-(28x-339)=0
We multiply parentheses
9x-(28x-339)-99-12=0
We get rid of parentheses
9x-28x+339-99-12=0
We add all the numbers together, and all the variables
-19x+228=0
We move all terms containing x to the left, all other terms to the right
-19x=-228
x=-228/-19
x=+12
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