5/21f=-8

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Solution for 5/21f=-8 equation: 



5/21f=-8

We move all terms to the left:

5/21f-(-8)=0



Domain of the equation: 21f!=0

f!=0/21

f!=0

f∈R



We add all the numbers together, and all the variables

5/21f+8=0

We multiply all the terms by the denominator


8*21f+5=0

Wy multiply elements

168f+5=0

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

168f=-5

f=-5/168

f=-5/168

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