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-2(-5f-3)=26
We move all terms to the left:
-2(-5f-3)-(26)=0
We multiply parentheses
10f+6-26=0
We add all the numbers together, and all the variables
10f-20=0
We move all terms containing f to the left, all other terms to the right
10f=20
f=20/10
f=2
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