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x in (-oo:+oo)
X = (2/3)*(y-21) // - (2/3)*(y-21)
X-((2/3)*(y-21)) = 0
(-2/3)*(y-21)+X = 0
X-2/3*(y-21) = 0
X-2/3*(y-21) = 0
X-2/3*y+14 = 0
X-2/3*y+14 = 0
x belongs to the empty set
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