9x-3x=-30-12

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



9x-3x=-30-12

We move all terms to the left:

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

We add all the numbers together, and all the variables

9x-3x-(-42)=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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