x+3=-7-x

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



x+3=-7-x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

x+1x+7+3=0

We add all the numbers together, and all the variables

2x+10=0

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

2x=-10

x=-10/2

x=-5

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