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f(1)=3(1)-2.1
We move all terms to the left:
f(1)-(3(1)-2.1)=0
We add all the numbers together, and all the variables
f1-(28.9)=0
We add all the numbers together, and all the variables
f-28.9=0
We move all terms containing f to the left, all other terms to the right
f=28.9
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