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f(5.1.-1)=(-5.-2)
We move all terms to the left:
f(5.1.-1)-((-5.-2))=0
We add all the numbers together, and all the variables
f0-((-7))=0
We add all the numbers together, and all the variables
f+7=0
We move all terms containing f to the left, all other terms to the right
f=-7
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