-81=-3(u-72)

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Solution for -81=-3(u-72) equation: 



-81=-3(u-72)

We move all terms to the left:

-81-(-3(u-72))=0



We calculate terms in parentheses: -(-3(u-72)), so:

-3(u-72)

We multiply parentheses

-3u+216

Back to the equation:

-(-3u+216)



We get rid of parentheses

3u-216-81=0

We add all the numbers together, and all the variables

3u-297=0

We move all terms containing u to the left, all other terms to the right

3u=297

u=297/3

u=99

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