21-9f=20(f-6)

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Solution for 21-9f=20(f-6) equation: 



21-9f=20(f-6)

We move all terms to the left:

21-9f-(20(f-6))=0



We calculate terms in parentheses: -(20(f-6)), so:

20(f-6)

We multiply parentheses

20f-120

Back to the equation:

-(20f-120)



We get rid of parentheses

-9f-20f+120+21=0

We add all the numbers together, and all the variables

-29f+141=0

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

-29f=-141

f=-141/-29

f=4+25/29

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