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-21+3x=6x+48
We move all terms to the left:
-21+3x-(6x+48)=0
We get rid of parentheses
3x-6x-48-21=0
We add all the numbers together, and all the variables
-3x-69=0
We move all terms containing x to the left, all other terms to the right
-3x=69
x=69/-3
x=-23
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