9x=21x+8

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Solution for 9x=21x+8 equation: 



9x=21x+8

We move all terms to the left:

9x-(21x+8)=0

We get rid of parentheses

9x-21x-8=0

We add all the numbers together, and all the variables

-12x-8=0

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

-12x=8

x=8/-12

x=-2/3

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