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9x+3=11x-21=5x-2
We move all terms to the left:
9x+3-(11x-21)=0
We get rid of parentheses
9x-11x+21+3=0
We add all the numbers together, and all the variables
-2x+24=0
We move all terms containing x to the left, all other terms to the right
-2x=-24
x=-24/-2
x=+12
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