3x+x=7+3x

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



3x+x=7+3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

4x-(3x+7)=0

We get rid of parentheses

4x-3x-7=0

We add all the numbers together, and all the variables

x-7=0

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

x=7

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