3x+9=12x-54

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Solution for 3x+9=12x-54 equation: 



3x+9=12x-54

We move all terms to the left:

3x+9-(12x-54)=0

We get rid of parentheses

3x-12x+54+9=0

We add all the numbers together, and all the variables

-9x+63=0

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

-9x=-63

x=-63/-9

x=+7

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