3x-15=7x-x

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Solution for 3x-15=7x-x equation: 



3x-15=7x-x

We move all terms to the left:

3x-15-(7x-x)=0

We add all the numbers together, and all the variables

3x-(+6x)-15=0

We get rid of parentheses

3x-6x-15=0

We add all the numbers together, and all the variables

-3x-15=0

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

-3x=15

x=15/-3

x=-5

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