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R in (-oo:+oo)
R-((1/2)*(4*R+2)) = 0
(-1/2)*(4*R+2)+R = 0
R-1/2*(4*R+2) = 0
R-1/2*(4*R+2) = 0
-R-1 = 0
-R-1 = 0
-R-1 = 0 // + 1
-R = 1 // * -1
R = -1
R = -1
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