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