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2x-9=8x+21
We move all terms to the left:
2x-9-(8x+21)=0
We get rid of parentheses
2x-8x-21-9=0
We add all the numbers together, and all the variables
-6x-30=0
We move all terms containing x to the left, all other terms to the right
-6x=30
x=30/-6
x=-5
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