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r in (-oo:+oo)
(-5/2)*r = -35/4 // + -35/4
(-5/2)*r-(-35/4) = 0
(-5/2)*r+35/4 = 0
35/4-5/2*r = 0 // - 35/4
-5/2*r = -35/4 // : -5/2
r = -35/4/(-5/2)
r = 7/2
r = 7/2
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