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x in (-oo:+oo)
x = (2/3)*y-4 // - (2/3)*y-4
x-((2/3)*y)+4 = 0
x+(-2/3)*y+4 = 0
x-2/3*y+4 = 0 // - 4-2/3*y
x = -(4-2/3*y)
x = -(4-2/3*y)
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