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9-21=4x-6
We move all terms to the left:
9-21-(4x-6)=0
We add all the numbers together, and all the variables
-(4x-6)-12=0
We get rid of parentheses
-4x+6-12=0
We add all the numbers together, and all the variables
-4x-6=0
We move all terms containing x to the left, all other terms to the right
-4x=6
x=6/-4
x=-1+1/2
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