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Sage give only three of five roots of simple equation

The equation below

f=-32/59049r^6 + 32/2187r^5 - 32/243r^4 + 352/729r^3 - 56/81r^2 + 8/27r

solve(f,r)

[r=−3sqrt(3)/2+9,r=3sqrt(3)/2+9,r=0]

Sage give only three of five roots of simple equation

The equation below

f=-32/59049r^6
f=-32/59049*r^6 + 32/2187r^5 32/2187*r^5 - 32/243r^4 32/243*r^4 + 352/729r^3 352/729*r^3 - 56/81r^2 56/81*r^2 + 8/27r 8/27*r solve(f,r) solve(f,r) [r=−3sqrt(3)/2+9,r=3sqrt(3)/2+9,r=0] [r=−3*sqrt(3)/2+9,r=3*sqrt(3)/2+9,r=0]