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r in (-oo:+oo)
3/4 = r/28 // - r/28
3/4-(r/28) = 0
3/4-1/28*r = 0 // - 3/4
-1/28*r = -3/4 // : -1/28
r = -3/4/(-1/28)
r = 21
r = 21
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