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49/56=21f
We move all terms to the left:
49/56-(21f)=0
We multiply all the terms by the denominator
-21f*56+49=0
Wy multiply elements
-1176f+49=0
We move all terms containing f to the left, all other terms to the right
-1176f=-49
f=-49/-1176
f=1/24
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