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x in (-oo:+oo)
x = (4/23)*(130-y) // - (4/23)*(130-y)
x-((4/23)*(130-y)) = 0
(-4/23)*(130-y)+x = 0
x-4/23*(130-y) = 0
x-4/23*(130-y) = 0
x+4/23*y-520/23 = 0
x+4/23*y-520/23 = 0
x+4/23*y-520/23 = 0 // - 4/23*y-520/23
x = -(4/23*y-520/23)
x = 520/23-(4/23*y)
x = 520/23-(4/23*y)
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