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r in (-oo:+oo)
3.2 = r/4+6.2 // - r/4+6.2
3.2-(r/4)-6.2 = 0
-1/4*r-3 = 0 // + 3
-1/4*r = 3 // : -1/4
r = 3/(-1/4)
r = -12
r = -12
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