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r in (-oo:+oo)
(3/10)*r = 1/2 // - 1/2
(3/10)*r-(1/2) = 0
(3/10)*r-1/2 = 0
3/10*r-1/2 = 0 // + 1/2
3/10*r = 1/2 // : 3/10
r = 1/2/3/10
r = 5/3
r = 5/3
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