27=21-6x

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Solution for 27=21-6x equation: 



27=21-6x

We move all terms to the left:

27-(21-6x)=0

We add all the numbers together, and all the variables

-(-6x+21)+27=0

We get rid of parentheses

6x-21+27=0

We add all the numbers together, and all the variables

6x+6=0

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

6x=-6

x=-6/6

x=-1

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