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