30f+20=100-10f

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Solution for 30f+20=100-10f equation: 



30f+20=100-10f

We move all terms to the left:

30f+20-(100-10f)=0

We add all the numbers together, and all the variables

30f-(-10f+100)+20=0

We get rid of parentheses

30f+10f-100+20=0

We add all the numbers together, and all the variables

40f-80=0

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

40f=80

f=80/40

f=2

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