2x+84=105-x

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Solution for 2x+84=105-x equation: 



2x+84=105-x

We move all terms to the left:

2x+84-(105-x)=0

We add all the numbers together, and all the variables

2x-(-1x+105)+84=0

We get rid of parentheses

2x+1x-105+84=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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