18+3(9f-13)=9f-21

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Solution for 18+3(9f-13)=9f-21 equation: 



18+3(9f-13)=9f-21

We move all terms to the left:

18+3(9f-13)-(9f-21)=0

We multiply parentheses

27f-(9f-21)-39+18=0

We get rid of parentheses

27f-9f+21-39+18=0

We add all the numbers together, and all the variables

18f=0

f=0/18

f=0

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