9x-12=3x+42

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Solution for 9x-12=3x+42 equation: 



9x-12=3x+42

We move all terms to the left:

9x-12-(3x+42)=0

We get rid of parentheses

9x-3x-42-12=0

We add all the numbers together, and all the variables

6x-54=0

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

6x=54

x=54/6

x=9

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