9x+12=3x-30

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



9x+12=3x-30

We move all terms to the left:

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

We get rid of parentheses

9x-3x+30+12=0

We add all the numbers together, and all the variables

6x+42=0

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

6x=-42

x=-42/6

x=-7

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