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x in (-oo:+oo)
w = (1/7)*(x+y-z) // - (1/7)*(x+y-z)
w-((1/7)*(x+y-z)) = 0
(-1/7)*(x+y-z)+w = 0
w-1/7*(x+y-z) = 0
w-1/7*(x+y-z) = 0
w-1/7*x-1/7*y+1/7*z = 0
w-1/7*x-1/7*y+1/7*z = 0
w-1/7*x-1/7*y+1/7*z = 0 // - w-1/7*y+1/7*z
-1/7*x = -(w-1/7*y+1/7*z) // : -1/7
x = (-(w-1/7*y+1/7*z))/(-1/7)
x = 7*(w-1/7*y+1/7*z)
x = 7*(w-1/7*y+1/7*z)
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