21=5-2x

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Solution for 21=5-2x equation: 



21=5-2x

We move all terms to the left:

21-(5-2x)=0

We add all the numbers together, and all the variables

-(-2x+5)+21=0

We get rid of parentheses

2x-5+21=0

We add all the numbers together, and all the variables

2x+16=0

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

2x=-16

x=-16/2

x=-8

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