2x+21=8x-15

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Solution for 2x+21=8x-15 equation: 



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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