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(2/3)*(2/3)*(1/4) = 0
19.69*a+13*b+9.5*c;13*a+15.69*b+22*c;9.5*a+22*b+53.69*c
(1*((2*(2/3))/3))/4 = 0
(x^1*(((2/3)*x^2)/3))/4 = 0
0.9;3
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