6f-15=21

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Solution for 6f-15=21 equation: 



6f-15=21

We move all terms to the left:

6f-15-(21)=0

We add all the numbers together, and all the variables

6f-36=0

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

6f=36

f=36/6

f=6

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