21=a+14

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Solution for 21=a+14 equation: 



21=a+14

We move all terms to the left:

21-(a+14)=0

We get rid of parentheses

-a-14+21=0

We add all the numbers together, and all the variables

-1a+7=0

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

-a=-7

a=-7/-1

a=+7

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