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((8*x)/3)*y = x+y+z-243 // - x+y+z-243
((8*x)/3)*y-x-y-z+243 = 0
8/3*x*y-y-z+243 = 0 // - 243-y-z
8/3*x*y = -(243-y-z) // : 8/3*y
x = (-(243-y-z))/(8/3*y)
x = -3/8*y^-1*(243-y-z)
x = -3/8*y^-1*(243-y-z)
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