x+2x+12=-x-x-13

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Solution for x+2x+12=-x-x-13 equation: 



x+2x+12=-x-x-13

We move all terms to the left:

x+2x+12-(-x-x-13)=0

We add all the numbers together, and all the variables

x+2x-(-2x-13)+12=0

We add all the numbers together, and all the variables

3x-(-2x-13)+12=0

We get rid of parentheses

3x+2x+13+12=0

We add all the numbers together, and all the variables

5x+25=0

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

5x=-25

x=-25/5

x=-5

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