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r in (-oo:+oo)
3-(r/8) = -9/2 // + -9/2
3-(r/8)-(-9/2) = 0
9/2-(r/8)+3 = 0
15/2-1/8*r = 0 // - 15/2
-1/8*r = -15/2 // : -1/8
r = -15/2/(-1/8)
r = 60
r = 60
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