3x+12-9x=30

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Solution for 3x+12-9x=30 equation: 



3x+12-9x=30

We move all terms to the left:

3x+12-9x-(30)=0

We add all the numbers together, and all the variables

-6x-18=0

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

-6x=18

x=18/-6

x=-3

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