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You can. a/b=a/c Divide both sides by a/c thus:
(a/b)/(a/c) = 1 To divide by a fraction, multiply by the reciprocal:
(a/b)*(c/a) = 1 Cancel the a c/b=1 multiply both sides by b:
c=b.
If you initially cancel the a's then 1/b = 1/c Multiply both sides by b and both sides by c
c=b which is the same answer.