-21+7x+5x=12+x

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Solution for -21+7x+5x=12+x equation: 



-21+7x+5x=12+x

We move all terms to the left:

-21+7x+5x-(12+x)=0

We add all the numbers together, and all the variables

7x+5x-(x+12)-21=0

We add all the numbers together, and all the variables

12x-(x+12)-21=0

We get rid of parentheses

12x-x-12-21=0

We add all the numbers together, and all the variables

11x-33=0

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

11x=33

x=33/11

x=3

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