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x in (-oo:+oo)
H = (3/4)*(x+2*y) // - (3/4)*(x+2*y)
H-((3/4)*(x+2*y)) = 0
(-3/4)*(x+2*y)+H = 0
H-3/4*(x+2*y) = 0
H-3/4*(x+2*y) = 0
H-3/4*x-3/2*y = 0
H-3/4*x-3/2*y = 0
H-3/4*x-3/2*y = 0 // - H-3/2*y
-3/4*x = -(H-3/2*y) // : -3/4
x = (-(H-3/2*y))/(-3/4)
x = 4/3*(H-3/2*y)
x = 4/3*(H-3/2*y)
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