21=2x-5

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Solution for 21=2x-5 equation: 



21=2x-5

We move all terms to the left:

21-(2x-5)=0

We get rid of parentheses

-2x+5+21=0

We add all the numbers together, and all the variables

-2x+26=0

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

-2x=-26

x=-26/-2

x=+13

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