3=9x+12

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Solution for 3=9x+12 equation: 



3=9x+12

We move all terms to the left:

3-(9x+12)=0

We get rid of parentheses

-9x-12+3=0

We add all the numbers together, and all the variables

-9x-9=0

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

-9x=9

x=9/-9

x=-1

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