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f(-3)=11-2f
We move all terms to the left:
f(-3)-(11-2f)=0
We add all the numbers together, and all the variables
f(-3)-(-2f+11)=0
We multiply parentheses
-3f-(-2f+11)=0
We get rid of parentheses
-3f+2f-11=0
We add all the numbers together, and all the variables
-1f-11=0
We move all terms containing f to the left, all other terms to the right
-f=11
f=11/-1
f=-11
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