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x in (-oo:+oo)
x = 2*y-(x*(z/4)) // - 2*y-(x*(z/4))
x-(2*y)+x*(z/4) = 0
x-2*y+x*(z/4) = 0
1/4*x*z-2*y = 0 // + -2*y
1/4*x*z = -(-2*y) // : 1/4*z
x = (-(-2*y))/(1/4*z)
x = 8*y*z^-1
x = 8*y*z^-1
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