x+2(x-12)=30

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Solution for x+2(x-12)=30 equation: 



x+2(x-12)=30

We move all terms to the left:

x+2(x-12)-(30)=0

We multiply parentheses

x+2x-24-30=0

We add all the numbers together, and all the variables

3x-54=0

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

3x=54

x=54/3

x=18

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