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x in (-oo:+oo)
x-((2/3)*y) = -1 // + 1
x-((2/3)*y)+1 = 0
x+(-2/3)*y+1 = 0
x-2/3*y+1 = 0 // - 1-2/3*y
x = -(1-2/3*y)
x = -(1-2/3*y)
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