-4f+9=-2f-9

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Solution for -4f+9=-2f-9 equation: 



-4f+9=-2f-9

We move all terms to the left:

-4f+9-(-2f-9)=0

We get rid of parentheses

-4f+2f+9+9=0

We add all the numbers together, and all the variables

-2f+18=0

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

-2f=-18

f=-18/-2

f=+9

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