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21-3x=42+6x
We move all terms to the left:
21-3x-(42+6x)=0
We add all the numbers together, and all the variables
-3x-(6x+42)+21=0
We get rid of parentheses
-3x-6x-42+21=0
We add all the numbers together, and all the variables
-9x-21=0
We move all terms containing x to the left, all other terms to the right
-9x=21
x=21/-9
x=-2+1/3
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