18+x=30-3x

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Solution for 18+x=30-3x equation: 



18+x=30-3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

x-(-3x+30)+18=0

We get rid of parentheses

x+3x-30+18=0

We add all the numbers together, and all the variables

4x-12=0

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

4x=12

x=12/4

x=3

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