f+20=-f-10

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Solution for f+20=-f-10 equation: 



f+20=-f-10

We move all terms to the left:

f+20-(-f-10)=0

We add all the numbers together, and all the variables

f-(-1f-10)+20=0

We get rid of parentheses

f+1f+10+20=0

We add all the numbers together, and all the variables

2f+30=0

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

2f=-30

f=-30/2

f=-15

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