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r in (-oo:+oo)
(-7/4)*r = -35/8 // + -35/8
(-7/4)*r-(-35/8) = 0
(-7/4)*r+35/8 = 0
35/8-7/4*r = 0 // - 35/8
-7/4*r = -35/8 // : -7/4
r = -35/8/(-7/4)
r = 5/2
r = 5/2
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