x-7=2x-21

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Solution for x-7=2x-21 equation: 



x-7=2x-21

We move all terms to the left:

x-7-(2x-21)=0

We get rid of parentheses

x-2x+21-7=0

We add all the numbers together, and all the variables

-1x+14=0

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

-x=-14

x=-14/-1

x=+14

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