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2x+7=8x+21
We move all terms to the left:
2x+7-(8x+21)=0
We get rid of parentheses
2x-8x-21+7=0
We add all the numbers together, and all the variables
-6x-14=0
We move all terms containing x to the left, all other terms to the right
-6x=14
x=14/-6
x=-2+1/3
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