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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-1.6=0
We move all terms containing f to the left, all other terms to the right
f=1.6
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