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r in (-oo:+oo)
-6 = -r/2 // + -r/2
-(-r/2)-6 = 0
(1/2)*r-6 = 0
1/2*r-6 = 0 // + 6
1/2*r = 6 // : 1/2
r = 6/1/2
r = 12
r = 12
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