3x+x-15=25-x

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Solution for 3x+x-15=25-x equation: 



3x+x-15=25-x

We move all terms to the left:

3x+x-15-(25-x)=0

We add all the numbers together, and all the variables

3x+x-(-1x+25)-15=0

We add all the numbers together, and all the variables

4x-(-1x+25)-15=0

We get rid of parentheses

4x+1x-25-15=0

We add all the numbers together, and all the variables

5x-40=0

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

5x=40

x=40/5

x=8

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