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-2x=-9x+21
We move all terms to the left:
-2x-(-9x+21)=0
We get rid of parentheses
-2x+9x-21=0
We add all the numbers together, and all the variables
7x-21=0
We move all terms containing x to the left, all other terms to the right
7x=21
x=21/7
x=3
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