-3x=21+9

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Solution for -3x=21+9 equation: 



-3x=21+9

We move all terms to the left:

-3x-(21+9)=0

We add all the numbers together, and all the variables

-3x-30=0

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

-3x=30

x=30/-3

x=-10

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