9x-12+12x-18=18x+9

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Solution for 9x-12+12x-18=18x+9 equation: 



9x-12+12x-18=18x+9

We move all terms to the left:

9x-12+12x-18-(18x+9)=0

We add all the numbers together, and all the variables

21x-(18x+9)-30=0

We get rid of parentheses

21x-18x-9-30=0

We add all the numbers together, and all the variables

3x-39=0

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

3x=39

x=39/3

x=13

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