7-x=7+3x

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Solution for 7-x=7+3x equation: 



7-x=7+3x

We move all terms to the left:

7-x-(7+3x)=0

We add all the numbers together, and all the variables

-x-(3x+7)+7=0

We add all the numbers together, and all the variables

-1x-(3x+7)+7=0

We get rid of parentheses

-1x-3x-7+7=0

We add all the numbers together, and all the variables

-4x=0

x=0/-4

x=0

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