7x+2x=2x-21

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Solution for 7x+2x=2x-21 equation: 



7x+2x=2x-21

We move all terms to the left:

7x+2x-(2x-21)=0

We add all the numbers together, and all the variables

9x-(2x-21)=0

We get rid of parentheses

9x-2x+21=0

We add all the numbers together, and all the variables

7x+21=0

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

7x=-21

x=-21/7

x=-3

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