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2x+21=8x-15
We move all terms to the left:
2x+21-(8x-15)=0
We get rid of parentheses
2x-8x+15+21=0
We add all the numbers together, and all the variables
-6x+36=0
We move all terms containing x to the left, all other terms to the right
-6x=-36
x=-36/-6
x=+6
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