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R in (-oo:+oo)
11*R+17/4 = -4 // + 4
11*R+17/4+4 = 0
11*R+33/4 = 0 // - 33/4
11*R = -33/4 // : 11
R = -33/4/11
R = -3/4
R = -3/4
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