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r in (-oo:+oo)
(-7/4)*r = -63/16 // + -63/16
(-7/4)*r-(-63/16) = 0
(-7/4)*r+63/16 = 0
63/16-7/4*r = 0 // - 63/16
-7/4*r = -63/16 // : -7/4
r = -63/16/(-7/4)
r = 9/4
r = 9/4
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