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r in (-oo:+oo)
49 = 1188*(29/120)*r // - 1188*(29/120)*r
49-(1188*(29/120)*r) = 0
(-2871/10)*r+49 = 0
49-2871/10*r = 0 // - 49
-2871/10*r = -49 // : -2871/10
r = -49/(-2871/10)
r = 490/2871
r = 490/2871
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