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43(f+19)=100
We move all terms to the left:
43(f+19)-(100)=0
We multiply parentheses
43f+817-100=0
We add all the numbers together, and all the variables
43f+717=0
We move all terms containing f to the left, all other terms to the right
43f=-717
f=-717/43
f=-16+29/43
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