3x+21=-2x-4=-5x

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Solution for 3x+21=-2x-4=-5x equation: 



3x+21=-2x-4=-5x

We move all terms to the left:

3x+21-(-2x-4)=0

We get rid of parentheses

3x+2x+4+21=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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