-21=-u/6

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Solution for -21=-u/6 equation: 



-21=-u/6

We move all terms to the left:

-21-(-u/6)=0

We get rid of parentheses

u/6-21=0

We multiply all the terms by the denominator


u-21*6=0

We add all the numbers together, and all the variables

u-126=0

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

u=126

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