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f(1)=7(1-1)+8
We move all terms to the left:
f(1)-(7(1-1)+8)=0
We add all the numbers together, and all the variables
f1-(70+8)=0
We add all the numbers together, and all the variables
f-78=0
We move all terms containing f to the left, all other terms to the right
f=78
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