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r in (-oo:+oo)
(1/2)*r+4 = (3/4)*r-(3/2) // - (3/4)*r-(3/2)
(1/2)*r-((3/4)*r)+3/2+4 = 0
(1/2)*r+(-3/4)*r+3/2+4 = 0
11/2-1/4*r = 0 // - 11/2
-1/4*r = -11/2 // : -1/4
r = -11/2/(-1/4)
r = 22
r = 22
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