15=-x+-3

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Solution for 15=-x+-3 equation: 



15=-x+-3

We move all terms to the left:

15-(-x+-3)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

1x+3+15=0

We add all the numbers together, and all the variables

x+18=0

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

x=-18

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