6f+9=87

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Solution for 6f+9=87 equation: 



6f+9=87

We move all terms to the left:

6f+9-(87)=0

We add all the numbers together, and all the variables

6f-78=0

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

6f=78

f=78/6

f=13

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