12+2f=20

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Solution for 12+2f=20 equation: 



12+2f=20

We move all terms to the left:

12+2f-(20)=0

We add all the numbers together, and all the variables

2f-8=0

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

2f=8

f=8/2

f=4

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