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f(0.5)=2(0.5)-3
We move all terms to the left:
f(0.5)-(2(0.5)-3)=0
We add all the numbers together, and all the variables
f(0.5)+2=0
We multiply parentheses
0.5f+2=0
We move all terms containing f to the left, all other terms to the right
0.5f=-2
f=-2/0.5
f=-4
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