-8f+9=-10f-9

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Solution for -8f+9=-10f-9 equation: 



-8f+9=-10f-9

We move all terms to the left:

-8f+9-(-10f-9)=0

We get rid of parentheses

-8f+10f+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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