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(4/5)*x+1/z-15-3 = 0
4/5*x+z^-1-18 = 0 // - z^-1-18
4/5*x = -(z^-1-18) // : 4/5
x = (-(z^-1-18))/4/5
x = 5/4*(18-z^-1)
x = 5/4*(18-z^-1)
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