3x=84+x

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Solution for 3x=84+x equation: 



3x=84+x

We move all terms to the left:

3x-(84+x)=0

We add all the numbers together, and all the variables

3x-(x+84)=0

We get rid of parentheses

3x-x-84=0

We add all the numbers together, and all the variables

2x-84=0

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

2x=84

x=84/2

x=42

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