x+21=2x+3

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Solution for x+21=2x+3 equation: 



x+21=2x+3

We move all terms to the left:

x+21-(2x+3)=0

We get rid of parentheses

x-2x-3+21=0

We add all the numbers together, and all the variables

-1x+18=0

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

-x=-18

x=-18/-1

x=+18

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