21=a+28/2

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Solution for 21=a+28/2 equation:


21=a+28/2

We simplify the equation to the form, which is simple to understand 
21=a+28/2

Simplifying:
21=a+14

We move all terms containing a to the left and all other terms to the right. 
-1a=+14-21

We simplify left and right side of the equation. 
-1a=-7

We divide both sides of the equation by -01 to get a. 
a=7

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