-21=-3(u-75)

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Solution for -21=-3(u-75) equation: 



-21=-3(u-75)

We move all terms to the left:

-21-(-3(u-75))=0



We calculate terms in parentheses: -(-3(u-75)), so:

-3(u-75)

We multiply parentheses

-3u+225

Back to the equation:

-(-3u+225)



We get rid of parentheses

3u-225-21=0

We add all the numbers together, and all the variables

3u-246=0

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

3u=246

u=246/3

u=82

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