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r in (-oo:+oo)
196 = (r^1)/4 // - (r^1)/4
196-((r^1)/4) = 0
196-(r/4) = 0
196-1/4*r = 0 // - 196
-1/4*r = -196 // : -1/4
r = -196/(-1/4)
r = 784
r = 784
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