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10x-27=6x+21
We move all terms to the left:
10x-27-(6x+21)=0
We get rid of parentheses
10x-6x-21-27=0
We add all the numbers together, and all the variables
4x-48=0
We move all terms containing x to the left, all other terms to the right
4x=48
x=48/4
x=12
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