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x in (-oo:+oo)
x = 27-((9*y)/7) // - 27-((9*y)/7)
x+(9*y)/7-27 = 0
x+9/7*y-27 = 0 // - 9/7*y-27
x = -(9/7*y-27)
x = 27-(9/7*y)
x = 27-(9/7*y)
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