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-15+6f-9=20-5f
We move all terms to the left:
-15+6f-9-(20-5f)=0
We add all the numbers together, and all the variables
6f-(-5f+20)-15-9=0
We add all the numbers together, and all the variables
6f-(-5f+20)-24=0
We get rid of parentheses
6f+5f-20-24=0
We add all the numbers together, and all the variables
11f-44=0
We move all terms containing f to the left, all other terms to the right
11f=44
f=44/11
f=4
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