8x-21=6x-5x

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Solution for 8x-21=6x-5x equation: 



8x-21=6x-5x

We move all terms to the left:

8x-21-(6x-5x)=0

We add all the numbers together, and all the variables

8x-(+x)-21=0

We get rid of parentheses

8x-x-21=0

We add all the numbers together, and all the variables

7x-21=0

We move all terms containing x to the left, all other terms to the right

7x=21

x=21/7

x=3

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