7f+8=99

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Solution for 7f+8=99 equation: 



7f+8=99

We move all terms to the left:

7f+8-(99)=0

We add all the numbers together, and all the variables

7f-91=0

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

7f=91

f=91/7

f=13

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