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-20-15f=-13f+19+f
We move all terms to the left:
-20-15f-(-13f+19+f)=0
We add all the numbers together, and all the variables
-15f-(-12f+19)-20=0
We get rid of parentheses
-15f+12f-19-20=0
We add all the numbers together, and all the variables
-3f-39=0
We move all terms containing f to the left, all other terms to the right
-3f=39
f=39/-3
f=-13
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