6-x=2x+21

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



6-x=2x+21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1x-(2x+21)+6=0

We get rid of parentheses

-1x-2x-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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