3+x=-15-2x

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Solution for 3+x=-15-2x equation: 



3+x=-15-2x

We move all terms to the left:

3+x-(-15-2x)=0

We add all the numbers together, and all the variables

x-(-2x-15)+3=0

We get rid of parentheses

x+2x+15+3=0

We add all the numbers together, and all the variables

3x+18=0

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

3x=-18

x=-18/3

x=-6

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