x+21=-3x-39

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Solution for x+21=-3x-39 equation: 



x+21=-3x-39

We move all terms to the left:

x+21-(-3x-39)=0

We get rid of parentheses

x+3x+39+21=0

We add all the numbers together, and all the variables

4x+60=0

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

4x=-60

x=-60/4

x=-15

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