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r in (-oo:+oo)
94.5/7 = 7*r // - 7*r
94.5/7-(7*r) = 0
94.5/7-7*r = 0
13.5-7*r = 0 // - 13.5
-7*r = -13.5 // : -7
r = -13.5/(-7)
r = 1.92857143
r = 1.92857143
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