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r in (-oo:+oo)
(-5/2)*r+(1/3)*r+1 = -1/12 // + -1/12
(-5/2)*r+(1/3)*r-(-1/12)+1 = 0
(-5/2)*r+(1/3)*r+1/12+1 = 0
13/12-13/6*r = 0 // - 13/12
-13/6*r = -13/12 // : -13/6
r = -13/12/(-13/6)
r = 1/2
r = 1/2
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