x-21=2x-15

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



x-21=2x-15

We move all terms to the left:

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

We get rid of parentheses

x-2x+15-21=0

We add all the numbers together, and all the variables

-1x-6=0

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

-x=6

x=6/-1

x=-6

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