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x in (-oo:+oo)
T = (1/2)*(x-y) // - (1/2)*(x-y)
T-((1/2)*(x-y)) = 0
(-1/2)*(x-y)+T = 0
T-1/2*(x-y) = 0
T-1/2*(x-y) = 0
T-1/2*x+1/2*y = 0
T-1/2*x+1/2*y = 0
T-1/2*x+1/2*y = 0 // - T+1/2*y
-1/2*x = -(T+1/2*y) // : -1/2
x = (-(T+1/2*y))/(-1/2)
x = 2*(T+1/2*y)
x = 2*(T+1/2*y)
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