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r in (-oo:+oo)
4/16 = r/36 // - r/36
4/16-(r/36) = 0
1/4-1/36*r = 0 // - 1/4
-1/36*r = -1/4 // : -1/36
r = -1/4/(-1/36)
r = 9
r = 9
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