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10(0.4+0.4f)=4f
We move all terms to the left:
10(0.4+0.4f)-(4f)=0
We add all the numbers together, and all the variables
10(0.4f+0.4)-4f=0
We add all the numbers together, and all the variables
-4f+10(0.4f+0.4)=0
We multiply parentheses
-4f+0f+4=0
We add all the numbers together, and all the variables
-3f+4=0
We move all terms containing f to the left, all other terms to the right
-3f=-4
f=-4/-3
f=1+1/3
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