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r in (-oo:+oo)
r/2.3 = -1.3 // + 1.3
r/2.3+1.3 = 0
0.43478261*r+1.3 = 0 // - 1.3
0.43478261*r = -1.3 // : 0.43478261
r = -1.3/0.43478261
r = -2.98999999
r = -2.98999999
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