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f(-5)=0.5(-5)-2
We move all terms to the left:
f(-5)-(0.5(-5)-2)=0
We add all the numbers together, and all the variables
f(-5)+4.5=0
We multiply parentheses
-5f+4.5=0
We move all terms containing f to the left, all other terms to the right
-5f=-4.5
f=-4.5/-5
f=3/3.33333333333
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