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r in (-oo:+oo)
(-3/4)*r+3*r = (1/3)*r+23/3 // - (1/3)*r+23/3
(-3/4)*r+3*r-((1/3)*r)-(23/3) = 0
(-3/4)*r+3*r+(-1/3)*r-23/3 = 0
23/12*r-23/3 = 0 // + 23/3
23/12*r = 23/3 // : 23/12
r = 23/3/23/12
r = 4
r = 4
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