x+3x+5=-x-15

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Solution for x+3x+5=-x-15 equation: 



x+3x+5=-x-15

We move all terms to the left:

x+3x+5-(-x-15)=0

We add all the numbers together, and all the variables

x+3x-(-1x-15)+5=0

We add all the numbers together, and all the variables

4x-(-1x-15)+5=0

We get rid of parentheses

4x+1x+15+5=0

We add all the numbers together, and all the variables

5x+20=0

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

5x=-20

x=-20/5

x=-4

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