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r in (-oo:+oo)
-r/4 = -10.4 // + 10.4
10.4-r/4 = 0
10.4-1/4*r = 0 // - 10.4
-1/4*r = -10.4 // : -1/4
r = -10.4/(-1/4)
r = 41.6
r = 41.6
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