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6x+8=2x+21
We move all terms to the left:
6x+8-(2x+21)=0
We get rid of parentheses
6x-2x-21+8=0
We add all the numbers together, and all the variables
4x-13=0
We move all terms containing x to the left, all other terms to the right
4x=13
x=13/4
x=3+1/4
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