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15-2f+4(-1)=-f-1
We move all terms to the left:
15-2f+4(-1)-(-f-1)=0
We add all the numbers together, and all the variables
-2f-(-1f-1)+15+4(-1)=0
We add all the numbers together, and all the variables
-2f-(-1f-1)+11=0
We get rid of parentheses
-2f+1f+1+11=0
We add all the numbers together, and all the variables
-1f+12=0
We move all terms containing f to the left, all other terms to the right
-f=-12
f=-12/-1
f=+12
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