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