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r in (-oo:+oo)
4.7 = r/3 // - r/3
4.7-(r/3) = 0
4.7-1/3*r = 0 // - 4.7
-1/3*r = -4.7 // : -1/3
r = -4.7/(-1/3)
r = 14.10000014
r = 14.10000014
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