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r in (-oo:+oo)
(7/10)*r = 44.8 // - 44.8
(7/10)*r-44.8 = 0
7/10*r-44.8 = 0 // + 44.8
7/10*r = 44.8 // : 7/10
r = 44.8/7/10
r = 64
r = 64
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