f(1)=20-2(1)

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Solution for f(1)=20-2(1) equation: 



f(1)=20-2(1)

We move all terms to the left:

f(1)-(20-2(1))=0

We add all the numbers together, and all the variables

f1-(-1)=0

We add all the numbers together, and all the variables

f+1=0

We move all terms containing f to the left, all other terms to the right

f=-1

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