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r in (-oo:+oo)
2 <= (4-(2*r))/3 // - (4-(2*r))/3
2-((4-(2*r))/3) <= 0
2-((4-2*r)/3) <= 0
(-1*(4-2*r))/3+2 <= 0
(-1*(4-2*r))/3+(2*3)/3 <= 0
2*3-1*(4-2*r) <= 0
2*r+2 <= 0
(2*r+2)/3 <= 0
(2*r+2)/3 <= 0 // * 3^2
3*(2*r+2) <= 0
( 2*r+2 )
2*r+2 <= 0 // - 2
2*r <= -2 // : 2
r <= -2/2
r <= -1
( 3 )
3 <= 0
r belongs to the empty set
(-oo:-1) (-1:+oo) 2*r+2 - + 3 + +
r in (-oo:-1>
(-oo:-1>
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