13+7f=90

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Solution for 13+7f=90 equation: 



13+7f=90

We move all terms to the left:

13+7f-(90)=0

We add all the numbers together, and all the variables

7f-77=0

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

7f=77

f=77/7

f=11

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