45=2f+9

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Solution for 45=2f+9 equation: 



45=2f+9

We move all terms to the left:

45-(2f+9)=0

We get rid of parentheses

-2f-9+45=0

We add all the numbers together, and all the variables

-2f+36=0

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

-2f=-36

f=-36/-2

f=+18

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