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r in (-oo:+oo)
78 = (2/3)*r // - (2/3)*r
78-((2/3)*r) = 0
(-2/3)*r+78 = 0
78-2/3*r = 0 // - 78
-2/3*r = -78 // : -2/3
r = -78/(-2/3)
r = 117
r = 117
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