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r in (-oo:+oo)
-(2*r)-1.3 = -2/3 // + -2/3
-(2*r)-(-2/3)-1.3 = 0
2/3-2*r-1.3 = 0
-2*r-0.63333333 = 0 // + 0.63333333
-2*r = 0.63333333 // : -2
r = 0.63333333/(-2)
r = -0.31666667
r = -0.31666667
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