7x+1x=21+9x

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Solution for 7x+1x=21+9x equation: 



7x+1x=21+9x

We move all terms to the left:

7x+1x-(21+9x)=0

We add all the numbers together, and all the variables

7x+1x-(9x+21)=0

We add all the numbers together, and all the variables

8x-(9x+21)=0

We get rid of parentheses

8x-9x-21=0

We add all the numbers together, and all the variables

-1x-21=0

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

-x=21

x=21/-1

x=-21

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