30+3f-6f-15=90

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Solution for 30+3f-6f-15=90 equation: 



30+3f-6f-15=90

We move all terms to the left:

30+3f-6f-15-(90)=0

We add all the numbers together, and all the variables

-3f-75=0

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

-3f=75

f=75/-3

f=-25

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