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-7(-f-3)-2f=-f-9
We move all terms to the left:
-7(-f-3)-2f-(-f-9)=0
We add all the numbers together, and all the variables
-7(-1f-3)-2f-(-1f-9)=0
We add all the numbers together, and all the variables
-2f-7(-1f-3)-(-1f-9)=0
We multiply parentheses
-2f+7f-(-1f-9)+21=0
We get rid of parentheses
-2f+7f+1f+9+21=0
We add all the numbers together, and all the variables
6f+30=0
We move all terms containing f to the left, all other terms to the right
6f=-30
f=-30/6
f=-5
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