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r in (-oo:+oo)
(9/4)*r = -37/32 // + -37/32
(9/4)*r-(-37/32) = 0
(9/4)*r+37/32 = 0
9/4*r+37/32 = 0 // - 37/32
9/4*r = -37/32 // : 9/4
r = -37/32/9/4
r = -37/72
r = -37/72
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