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9(400)=5f-160
We move all terms to the left:
9(400)-(5f-160)=0
We get rid of parentheses
-5f+160+9400=0
We add all the numbers together, and all the variables
-5f+9560=0
We move all terms containing f to the left, all other terms to the right
-5f=-9560
f=-9560/-5
f=+1912
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