3-9x=21

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Solution for 3-9x=21 equation: 



3-9x=21

We move all terms to the left:

3-9x-(21)=0

We add all the numbers together, and all the variables

-9x-18=0

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

-9x=18

x=18/-9

x=-2

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