Answer :

68=r/4
to get r alone you need to times it by its reciprical which is the opposite (do it to both sides
example: 6/3=3/6

68=r/4 × 4/1
272=r
 68 = r/4.  Rearrange.
r/4 = 68.

Cross multiply.
r = 4*68
r =  272

That's it.

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