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r in (-oo:+oo)
(1/2)*r-3 = 3*(4-((3/2)*r)) // - 3*(4-((3/2)*r))
(1/2)*r-(3*(4-((3/2)*r)))-3 = 0
(1/2)*r-3*((-3/2)*r+4)-3 = 0
r/2-3*(4-3/2*r)-3 = 0
(-3*2*(4-3/2*r))/2+r/2+(-3*2)/2 = 0
r-3*2*(4-3/2*r)-3*2 = 0
10*r-24-6 = 0
10*r-30 = 0
(10*r-30)/2 = 0
(10*r-30)/2 = 0 // * 2
10*r-30 = 0
10*r-30 = 0 // + 30
10*r = 30 // : 10
r = 30/10
r = 3
r = 3
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