21+6f=51

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Solution for 21+6f=51 equation: 



21+6f=51

We move all terms to the left:

21+6f-(51)=0

We add all the numbers together, and all the variables

6f-30=0

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

6f=30

f=30/6

f=5

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