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r in (-oo:+oo)
54 = 1800*(3/4)*r // - 1800*(3/4)*r
54-(1800*(3/4)*r) = 0
54-1350*r = 0
54-1350*r = 0 // - 54
-1350*r = -54 // : -1350
r = -54/(-1350)
r = 1/25
r = 1/25
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