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x*x_2*((4*x_4)/3) = 18 // - 18
x*x_2*((4*x_4)/3)-18 = 0
4/3*x*x_2*x_4-18 = 0 // + 18
4/3*x*x_2*x_4 = 18 // : 4/3*x_2*x_4
x = 18/(4/3*x_2*x_4)
x = 27/2*x_2^-1*x_4^-1
x = 27/2*x_2^-1*x_4^-1
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