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