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r in (-oo:+oo)
4*r+12/8 = 5*r-(15/5) // - 5*r-(15/5)
4*r-(5*r)+12/8+15/5 = 0
4*r-5*r+12/8+15/5 = 0
9/2-r = 0 // - 9/2
-r = -9/2 // * -1
r = 9/2
r = 9/2
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