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-11f-11f-18=20-20f
We move all terms to the left:
-11f-11f-18-(20-20f)=0
We add all the numbers together, and all the variables
-11f-11f-(-20f+20)-18=0
We add all the numbers together, and all the variables
-22f-(-20f+20)-18=0
We get rid of parentheses
-22f+20f-20-18=0
We add all the numbers together, and all the variables
-2f-38=0
We move all terms containing f to the left, all other terms to the right
-2f=38
f=38/-2
f=-19
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