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(1/8)*(x+y+z) = w // - w
(1/8)*(x+y+z)-w = 0
1/8*(x+y+z)-w = 0
1/8*(x+y+z)-w = 0
1/8*x-w+1/8*y+1/8*z = 0
1/8*x-w+1/8*y+1/8*z = 0
1/8*x-w+1/8*y+1/8*z = 0 // - 1/8*y-w+1/8*z
1/8*x = -(1/8*y-w+1/8*z) // : 1/8
x = (-(1/8*y-w+1/8*z))/1/8
x = -8*(1/8*y-w+1/8*z)
x = -8*(1/8*y-w+1/8*z)
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