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x in (-oo:+oo)
(2/3)*x-11 = y+4 // - y+4
(2/3)*x-y-11-4 = 0
2/3*x-y-15 = 0 // + -y-15
2/3*x = -(-y-15) // : 2/3
x = (-(-y-15))/2/3
x = 3/2*(y+15)
x = 3/2*(y+15)
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