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f(-6)=4(-6)-5
We move all terms to the left:
f(-6)-(4(-6)-5)=0
We add all the numbers together, and all the variables
f(-6)+29=0
We multiply parentheses
-6f+29=0
We move all terms containing f to the left, all other terms to the right
-6f=-29
f=-29/-6
f=4+5/6
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