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5(f+20)+7=10f
We move all terms to the left:
5(f+20)+7-(10f)=0
We add all the numbers together, and all the variables
-10f+5(f+20)+7=0
We multiply parentheses
-10f+5f+100+7=0
We add all the numbers together, and all the variables
-5f+107=0
We move all terms containing f to the left, all other terms to the right
-5f=-107
f=-107/-5
f=21+2/5
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