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-5(1+7f)=28
We move all terms to the left:
-5(1+7f)-(28)=0
We add all the numbers together, and all the variables
-5(7f+1)-28=0
We multiply parentheses
-35f-5-28=0
We add all the numbers together, and all the variables
-35f-33=0
We move all terms containing f to the left, all other terms to the right
-35f=33
f=33/-35
f=-33/35
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