21=17+a/3

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Solution for 21=17+a/3 equation:


21=17+a/3

We simplify the equation to the form, which is simple to understand 
21=17+a/3

Simplifying:
21=17 + 0.333333333333a

We move all terms containing a to the left and all other terms to the right. 
-0.333333333333a=+17-21

We simplify left and right side of the equation. 
-0.333333333333a=-4

We divide both sides of the equation by -00.333333333333 to get a. 
a=12

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