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R in (-oo:+oo)
(R-11)/3 = -7 // + 7
(R-11)/3+7 = 0
(R-11)/3+(3*7)/3 = 0
R+3*7-11 = 0
R+10 = 0
(R+10)/3 = 0
(R+10)/3 = 0 // * 3
R+10 = 0
R+10 = 0 // - 10
R = -10
R = -10
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