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f=1/7(+-)
We move all terms to the left:
f-(1/7(+-))=0
We add all the numbers together, and all the variables
f-(1/70)=0
We get rid of parentheses
f-1/70=0
We multiply all the terms by the denominator
f*70-1=0
Wy multiply elements
70f-1=0
We move all terms containing f to the left, all other terms to the right
70f=1
f=1/70
f=1/70
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