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r in (-oo:+oo)
1/4 = r/4+(3*r)/4-4 // - r/4+(3*r)/4-4
1/4-(r/4)-((3*r)/4)+4 = 0
(-3/4)*r-(r/4)+1/4+4 = 0
17/4-r = 0 // - 17/4
-r = -17/4 // * -1
r = 17/4
r = 17/4
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