10f+9=-9+f

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



10f+9=-9+f

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

10f-f+9+9=0

We add all the numbers together, and all the variables

9f+18=0

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

9f=-18

f=-18/9

f=-2

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