0.4(f+9)=12

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Solution for 0.4(f+9)=12 equation: 



0.4(f+9)=12

We move all terms to the left:

0.4(f+9)-(12)=0

We multiply parentheses

0.4f+3.6-12=0

We add all the numbers together, and all the variables

0.4f-8.4=0

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

0.4f=8.4

f=8.4/0.4

f=21

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