7/8u=-21

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Solution for 7/8u=-21 equation: 



7/8u=-21

We move all terms to the left:

7/8u-(-21)=0



Domain of the equation: 8u!=0

u!=0/8

u!=0

u∈R



We add all the numbers together, and all the variables

7/8u+21=0

We multiply all the terms by the denominator


21*8u+7=0

Wy multiply elements

168u+7=0

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

168u=-7

u=-7/168

u=-1/24

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