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r in (-oo:+oo)
(1/4)*r-3 = 3*(4-((3/2)*r)) // - 3*(4-((3/2)*r))
(1/4)*r-(3*(4-((3/2)*r)))-3 = 0
(1/4)*r-3*((-3/2)*r+4)-3 = 0
r/4-3*(4-3/2*r)-3 = 0
(-3*4*(4-3/2*r))/4+r/4+(-3*4)/4 = 0
r-3*4*(4-3/2*r)-3*4 = 0
19*r-48-12 = 0
19*r-60 = 0
(19*r-60)/4 = 0
(19*r-60)/4 = 0 // * 4
19*r-60 = 0
19*r-60 = 0 // + 60
19*r = 60 // : 19
r = 60/19
r = 60/19
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