-7/3u=-21

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Solution for -7/3u=-21 equation: 



-7/3u=-21

We move all terms to the left:

-7/3u-(-21)=0



Domain of the equation: 3u!=0

u!=0/3

u!=0

u∈R



We add all the numbers together, and all the variables

-7/3u+21=0

We multiply all the terms by the denominator


21*3u-7=0

Wy multiply elements

63u-7=0

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

63u=7

u=7/63

u=1/9

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