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r in (-oo:+oo)
44*(7/22) = 2*r // - 2*r
44*(7/22)-(2*r) = 0
44*(7/22)-2*r = 0
14-2*r = 0 // - 14
-2*r = -14 // : -2
r = -14/(-2)
r = 7
r = 7
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