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r in (-oo:+oo)
(1/4)*r = 3/16 // - 3/16
(1/4)*r-(3/16) = 0
(1/4)*r-3/16 = 0
1/4*r-3/16 = 0 // + 3/16
1/4*r = 3/16 // : 1/4
r = 3/16/1/4
r = 3/4
r = 3/4
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