1 Answer

Mikelikespie · Answer 1 · 2019-01-11T08:18:15+0000

K = 4r - 7s
or I flip the side, so r will be on the left side
4r - 7s = K

move 7s to the other side, it becomes plus
4r - 7s = K
4r = K + 7s

move 4 to the other side, it becomes a divisor
4r = K + 7s
r =
$\boxed{\cfrac{K+7s}{4}}$

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