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R in (-oo:+oo)
-42 = (3/2)*R // - (3/2)*R
-((3/2)*R)-42 = 0
(-3/2)*R-42 = 0
-3/2*R-42 = 0 // + 42
-3/2*R = 42 // : -3/2
R = 42/(-3/2)
R = -28
R = -28
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