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r in (-oo:+oo)
-2 = 5/4-(r/3) // - 5/4-(r/3)
r/3-(5/4)-2 = 0
r/3-5/4-2 = 0
1/3*r-13/4 = 0 // + 13/4
1/3*r = 13/4 // : 1/3
r = 13/4/1/3
r = 39/4
r = 39/4
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