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x in (-oo:+oo)
x = (y/5)*(18-z) // - (y/5)*(18-z)
x-((y/5)*(18-z)) = 0
x-1*1/5*y*(18-z) = 0
x-1*1/5*y*(18-z) = 0
x-18/5*y+1/5*y*z = 0
x-18/5*y+1/5*y*z = 0
x-18/5*y+1/5*y*z = 0 // - 1/5*y*z-18/5*y
x = -(1/5*y*z-18/5*y)
x = -(1/5*y*z-18/5*y)
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