21=2x+4

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Solution for 21=2x+4 equation: 



21=2x+4

We move all terms to the left:

21-(2x+4)=0

We get rid of parentheses

-2x-4+21=0

We add all the numbers together, and all the variables

-2x+17=0

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

-2x=-17

x=-17/-2

x=8+1/2

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