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6f-1.3(3f-4)=6.5
We move all terms to the left:
6f-1.3(3f-4)-(6.5)=0
We add all the numbers together, and all the variables
6f-1.3(3f-4)-6.5=0
We multiply parentheses
6f-3.9f+5.2-6.5=0
We add all the numbers together, and all the variables
2.1f-1.3=0
We move all terms containing f to the left, all other terms to the right
2.1f=1.3
f=1.3/2.1
f=1/1.6153846153846
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