45-5f=20

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Solution for 45-5f=20 equation: 



45-5f=20

We move all terms to the left:

45-5f-(20)=0

We add all the numbers together, and all the variables

-5f+25=0

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

-5f=-25

f=-25/-5

f=+5

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