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r in (-oo:+oo)
(1/10)*r = 41/2 // - 41/2
(1/10)*r-(41/2) = 0
(1/10)*r-41/2 = 0
1/10*r-41/2 = 0 // + 41/2
1/10*r = 41/2 // : 1/10
r = 41/2/1/10
r = 205
r = 205
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