-2x+6=21+x

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Solution for -2x+6=21+x equation: 



-2x+6=21+x

We move all terms to the left:

-2x+6-(21+x)=0

We add all the numbers together, and all the variables

-2x-(x+21)+6=0

We get rid of parentheses

-2x-x-21+6=0

We add all the numbers together, and all the variables

-3x-15=0

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

-3x=15

x=15/-3

x=-5

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