3x+30=12+x

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



3x+30=12+x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3x-x-12+30=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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