2f+f=90

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Solution for 2f+f=90 equation: 



2f+f=90

We move all terms to the left:

2f+f-(90)=0

We add all the numbers together, and all the variables

3f-90=0

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

3f=90

f=90/3

f=30

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