6=9x-21

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Solution for 6=9x-21 equation: 



6=9x-21

We move all terms to the left:

6-(9x-21)=0

We get rid of parentheses

-9x+21+6=0

We add all the numbers together, and all the variables

-9x+27=0

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

-9x=-27

x=-27/-9

x=+3

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