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r in (-oo:+oo)
(-1/5)*r = (4^4)/5 // - (4^4)/5
(-1/5)*r-((4^4)/5) = 0
-1/5*r-256/5 = 0 // + 256/5
-1/5*r = 256/5 // : -1/5
r = 256/5/(-1/5)
r = -256
r = -256
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