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r in (-oo:+oo)
6.7 = r/4 // - r/4
6.7-(r/4) = 0
6.7-1/4*r = 0 // - 6.7
-1/4*r = -6.7 // : -1/4
r = -6.7/(-1/4)
r = 26.8
r = 26.8
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