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f(1.5)=2(1.5)+1
We move all terms to the left:
f(1.5)-(2(1.5)+1)=0
We add all the numbers together, and all the variables
f(1.5)-4=0
We multiply parentheses
1.5f-4=0
We move all terms containing f to the left, all other terms to the right
1.5f=4
f=4/1.5
f=2+1/1.5
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