3x+12=x+30

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Solution for 3x+12=x+30 equation: 



3x+12=x+30

We move all terms to the left:

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

We get rid of parentheses

3x-x-30+12=0

We add all the numbers together, and all the variables

2x-18=0

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

2x=18

x=18/2

x=9

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