-21=3(u+2)+6u

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Solution for -21=3(u+2)+6u equation:


-21=3(u+2)+6u

We simplify the equation to the form, which is simple to understand 
-21=3(u+2)+6u

Reorder the terms in parentheses
-21=+(+3u+6)+6u

Remove unnecessary parentheses
-21=+3u+6+6u

We move all terms containing u to the left and all other terms to the right. 
-3u-6u=+6+21

We simplify left and right side of the equation. 
-9u=+27

We divide both sides of the equation by -9 to get u. 
u=-3

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