-x-15=-3x-3

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



-x-15=-3x-3

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

2x-12=0

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

2x=12

x=12/2

x=6

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