-7x+9=21

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Solution for -7x+9=21 equation: 



-7x+9=21

We move all terms to the left:

-7x+9-(21)=0

We add all the numbers together, and all the variables

-7x-12=0

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

-7x=12

x=12/-7

x=-1+5/7

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