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r in (-oo:+oo)
r/2.3 = -4 // + 4
r/2.3+4 = 0
0.43478261*r+4 = 0 // - 4
0.43478261*r = -4 // : 0.43478261
r = -4/0.43478261
r = -9.19999997
r = -9.19999997
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