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r in (-oo:+oo)
2*r+6/8 = 3*r-(9/3) // - 3*r-(9/3)
2*r-(3*r)+6/8+9/3 = 0
2*r-3*r+6/8+9/3 = 0
15/4-r = 0 // - 15/4
-r = -15/4 // * -1
r = 15/4
r = 15/4
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