9-13x=21-9x

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Solution for 9-13x=21-9x equation: 



9-13x=21-9x

We move all terms to the left:

9-13x-(21-9x)=0

We add all the numbers together, and all the variables

-13x-(-9x+21)+9=0

We get rid of parentheses

-13x+9x-21+9=0

We add all the numbers together, and all the variables

-4x-12=0

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

-4x=12

x=12/-4

x=-3

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