3x+(x-9)=12

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Solution for 3x+(x-9)=12 equation: 



3x+(x-9)=12

We move all terms to the left:

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

We get rid of parentheses

3x+x-9-12=0

We add all the numbers together, and all the variables

4x-21=0

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

4x=21

x=21/4

x=5+1/4

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