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4x-6=-2x+21
We move all terms to the left:
4x-6-(-2x+21)=0
We get rid of parentheses
4x+2x-21-6=0
We add all the numbers together, and all the variables
6x-27=0
We move all terms containing x to the left, all other terms to the right
6x=27
x=27/6
x=4+1/2
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