x+21=-5x+15

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Solution for x+21=-5x+15 equation: 



x+21=-5x+15

We move all terms to the left:

x+21-(-5x+15)=0

We get rid of parentheses

x+5x-15+21=0

We add all the numbers together, and all the variables

6x+6=0

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

6x=-6

x=-6/6

x=-1

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