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r in (-oo:+oo)
r/1.5 = 24 // - 24
r/1.5-24 = 0
0.66666667*r-24 = 0 // + 24
0.66666667*r = 24 // : 0.66666667
r = 24/0.66666667
r = 35.99999982
r = 35.99999982
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