-2x-21=2x+15

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Solution for -2x-21=2x+15 equation: 



-2x-21=2x+15

We move all terms to the left:

-2x-21-(2x+15)=0

We get rid of parentheses

-2x-2x-15-21=0

We add all the numbers together, and all the variables

-4x-36=0

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

-4x=36

x=36/-4

x=-9

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