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6*(4/3)^3-a(4/3)^2+19(4/3)-20=0
6(64/27)-a(16/9)+19(4/3)-20=0
128/9-16a/9+76/3-20=0
128/9-16a/9+228/9-180/9=0
356-180-16a/9=0
176-16a/9=0
by cross multiplication
-16a=-176
a=176/16
a=11
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