x+3x=25-x

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Solution for x+3x=25-x equation: 



x+3x=25-x

We move all terms to the left:

x+3x-(25-x)=0

We add all the numbers together, and all the variables

x+3x-(-1x+25)=0

We add all the numbers together, and all the variables

4x-(-1x+25)=0

We get rid of parentheses

4x+1x-25=0

We add all the numbers together, and all the variables

5x-25=0

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

5x=25

x=25/5

x=5

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