15=-3x-15

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Solution for 15=-3x-15 equation: 



15=-3x-15

We move all terms to the left:

15-(-3x-15)=0

We get rid of parentheses

3x+15+15=0

We add all the numbers together, and all the variables

3x+30=0

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

3x=-30

x=-30/3

x=-10

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