-3/4u=21

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Solution for -3/4u=21 equation: 



-3/4u=21

We move all terms to the left:

-3/4u-(21)=0



Domain of the equation: 4u!=0

u!=0/4

u!=0

u∈R



We multiply all the terms by the denominator


-21*4u-3=0

Wy multiply elements

-84u-3=0

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

-84u=3

u=3/-84

u=-1/28

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