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f(0.5)=4*0.5^2-0.5
We move all terms to the left:
f(0.5)-(4*0.5^2-0.5)=0
We add all the numbers together, and all the variables
f(0.5)-0.5=0
We multiply parentheses
0.5f-0.5=0
We move all terms containing f to the left, all other terms to the right
0.5f=0.5
f=0.5/0.5
f=1
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