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x in (-oo:+oo)
X = (1/3)*(10*x-(3*y)) // - (1/3)*(10*x-(3*y))
X-((1/3)*(10*x-(3*y))) = 0
(-1/3)*(10*x-3*y)+X = 0
X-1/3*(10*x-3*y) = 0
X-1/3*(10*x-3*y) = 0
X-10/3*x+y = 0
X-10/3*x+y = 0
X-10/3*x+y = 0 // - X+y
-10/3*x = -(X+y) // : -10/3
x = (-(X+y))/(-10/3)
x = 3/10*(X+y)
x = 3/10*(X+y)
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