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r in (-oo:+oo)
(7*r)/8 = 4*r-75 // - 4*r-75
(7*r)/8-(4*r)+75 = 0
(7*r)/8-4*r+75 = 0
75-25/8*r = 0 // - 75
-25/8*r = -75 // : -25/8
r = -75/(-25/8)
r = 24
r = 24
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