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4(0.8f-0.5)=0.4

We move all terms to the left:

4(0.8f-0.5)-(0.4)=0

We add all the numbers together, and all the variables

4(0.8f-0.5)-0.4=0

We multiply parentheses

0f-2-0.4=0

We add all the numbers together, and all the variables

f-2.4=0

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

f=2.4

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