2f+9=-1+f

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Solution for 2f+9=-1+f equation: 



2f+9=-1+f

We move all terms to the left:

2f+9-(-1+f)=0

We add all the numbers together, and all the variables

2f-(f-1)+9=0

We get rid of parentheses

2f-f+1+9=0

We add all the numbers together, and all the variables

f+10=0

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

f=-10

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