-3/8u=21

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Solution for -3/8u=21 equation: 



-3/8u=21

We move all terms to the left:

-3/8u-(21)=0



Domain of the equation: 8u!=0

u!=0/8

u!=0

u∈R



We multiply all the terms by the denominator


-21*8u-3=0

Wy multiply elements

-168u-3=0

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

-168u=3

u=3/-168

u=-1/56

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