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r in (-oo:+oo)
(1/2)*r-3 = 3*(4-((2/3)*r)) // - 3*(4-((2/3)*r))
(1/2)*r-(3*(4-((2/3)*r)))-3 = 0
(1/2)*r-3*((-2/3)*r+4)-3 = 0
r/2-3*(4-2/3*r)-3 = 0
(-3*2*(4-2/3*r))/2+r/2+(-3*2)/2 = 0
r-3*2*(4-2/3*r)-3*2 = 0
5*r-24-6 = 0
5*r-30 = 0
(5*r-30)/2 = 0
(5*r-30)/2 = 0 // * 2
5*r-30 = 0
5*r-30 = 0 // + 30
5*r = 30 // : 5
r = 30/5
r = 6
r = 6
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