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r in (-oo:+oo)
176 = 2*(22/7)*r // - 2*(22/7)*r
176-(2*(22/7)*r) = 0
(-44/7)*r+176 = 0
176-44/7*r = 0 // - 176
-44/7*r = -176 // : -44/7
r = -176/(-44/7)
r = 28
r = 28
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