13=-4f=9

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Solution for 13=-4f=9 equation: 



13=-4f=9

We move all terms to the left:

13-(-4f)=0

We get rid of parentheses

4f+13=0

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

4f=-13

f=-13/4

f=-3+1/4

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