9x-3=21x-3x

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Solution for 9x-3=21x-3x equation: 



9x-3=21x-3x

We move all terms to the left:

9x-3-(21x-3x)=0

We add all the numbers together, and all the variables

9x-(+18x)-3=0

We get rid of parentheses

9x-18x-3=0

We add all the numbers together, and all the variables

-9x-3=0

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

-9x=3

x=3/-9

x=-1/3

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