21=3(a+5)

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Solution for 21=3(a+5) equation:


21=3(a+5)

We simplify the equation to the form, which is simple to understand
21=3(a+5)

Reorder the terms in parentheses
21=+(+3a+15)

Remove unnecessary parentheses
+21=+3a+15

We move all terms containing a to the left and all other terms to the right.
-3a=+15-21

We simplify left and right side of the equation.
-3a=-6

We divide both sides of the equation by -03 to get a.
a=2

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