9x-7=2x-21

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Solution for 9x-7=2x-21 equation: 



9x-7=2x-21

We move all terms to the left:

9x-7-(2x-21)=0

We get rid of parentheses

9x-2x+21-7=0

We add all the numbers together, and all the variables

7x+14=0

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

7x=-14

x=-14/7

x=-2

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