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x in (-oo:+oo)
x-((2/3)*y) = 12 // - 12
x-((2/3)*y)-12 = 0
x+(-2/3)*y-12 = 0
x-2/3*y-12 = 0 // + -2/3*y-12
x = -(-2/3*y-12)
x = 12-(-2/3*y)
x = 12-(-2/3*y)
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