20+4f=-20-f

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



20+4f=-20-f

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

4f+1f+20+20=0

We add all the numbers together, and all the variables

5f+40=0

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

5f=-40

f=-40/5

f=-8

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