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x in (-oo:+oo)
W = (1/5)*(x+y-z) // - (1/5)*(x+y-z)
W-((1/5)*(x+y-z)) = 0
(-1/5)*(x+y-z)+W = 0
W-1/5*(x+y-z) = 0
W-1/5*(x+y-z) = 0
W-1/5*x-1/5*y+1/5*z = 0
W-1/5*x-1/5*y+1/5*z = 0
W-1/5*x-1/5*y+1/5*z = 0 // - W-1/5*y+1/5*z
-1/5*x = -(W-1/5*y+1/5*z) // : -1/5
x = (-(W-1/5*y+1/5*z))/(-1/5)
x = 5*(W-1/5*y+1/5*z)
x = 5*(W-1/5*y+1/5*z)
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