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-10(f+23)=90
We move all terms to the left:
-10(f+23)-(90)=0
We multiply parentheses
-10f-230-90=0
We add all the numbers together, and all the variables
-10f-320=0
We move all terms containing f to the left, all other terms to the right
-10f=320
f=320/-10
f=-32
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