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r in (-oo:+oo)
r/5+3 = -5.5 // + 5.5
r/5+3+5.5 = 0
1/5*r+8.5 = 0 // - 8.5
1/5*r = -8.5 // : 1/5
r = -8.5/1/5
r = -42.5
r = -42.5
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