4f+20=10-f

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Solution for 4f+20=10-f equation: 



4f+20=10-f

We move all terms to the left:

4f+20-(10-f)=0

We add all the numbers together, and all the variables

4f-(-1f+10)+20=0

We get rid of parentheses

4f+1f-10+20=0

We add all the numbers together, and all the variables

5f+10=0

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

5f=-10

f=-10/5

f=-2

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