7x-21=-2x-6

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Solution for 7x-21=-2x-6 equation: 



7x-21=-2x-6

We move all terms to the left:

7x-21-(-2x-6)=0

We get rid of parentheses

7x+2x+6-21=0

We add all the numbers together, and all the variables

9x-15=0

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

9x=15

x=15/9

x=1+2/3

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