15+2f=21

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Solution for 15+2f=21 equation: 



15+2f=21

We move all terms to the left:

15+2f-(21)=0

We add all the numbers together, and all the variables

2f-6=0

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

2f=6

f=6/2

f=3

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