21=7(2a-1)

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Solution for 21=7(2a-1) equation:


21=7 (2a-1)

We simplify the equation to the form, which is simple to understand 
21=7(2a-1)

Reorder the terms in parentheses
21=+(+14a-7)

Remove unnecessary parentheses
+21=+14a-7

We move all terms containing a to the left and all other terms to the right. 
-14a=-7-21

We simplify left and right side of the equation. 
-14a=-28

We divide both sides of the equation by -014 to get a. 
a=2

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