7-x=15-3x

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



7-x=15-3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-1x-(-3x+15)+7=0

We get rid of parentheses

-1x+3x-15+7=0

We add all the numbers together, and all the variables

2x-8=0

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

2x=8

x=8/2

x=4

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