6-4x=21+x

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Solution for 6-4x=21+x equation: 



6-4x=21+x

We move all terms to the left:

6-4x-(21+x)=0

We add all the numbers together, and all the variables

-4x-(x+21)+6=0

We get rid of parentheses

-4x-x-21+6=0

We add all the numbers together, and all the variables

-5x-15=0

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

-5x=15

x=15/-5

x=-3

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