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14(f+20)=1400
We move all terms to the left:
14(f+20)-(1400)=0
We multiply parentheses
14f+280-1400=0
We add all the numbers together, and all the variables
14f-1120=0
We move all terms containing f to the left, all other terms to the right
14f=1120
f=1120/14
f=80
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