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f(-6)=36-2(-6)-5
We move all terms to the left:
f(-6)-(36-2(-6)-5)=0
We add all the numbers together, and all the variables
f(-6)-43=0
We multiply parentheses
-6f-43=0
We move all terms containing f to the left, all other terms to the right
-6f=43
f=43/-6
f=-7+1/6
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