15+3x=-7x-15

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



15+3x=-7x-15

We move all terms to the left:

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

We get rid of parentheses

3x+7x+15+15=0

We add all the numbers together, and all the variables

10x+30=0

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

10x=-30

x=-30/10

x=-3

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