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x in (-oo:+oo)
y+9 = (-14/3)*(x+9) // - (-14/3)*(x+9)
y-((-14/3)*(x+9))+9 = 0
(14/3)*(x+9)+y+9 = 0
14/3*(x+9)+y+9 = 0
14/3*(x+9)+y+9 = 0
14/3*x+y+9+42 = 0
14/3*x+y+51 = 0
14/3*x+y+51 = 0
14/3*x+y+51 = 0 // - y+51
14/3*x = -(y+51) // : 14/3
x = (-(y+51))/14/3
x = -3/14*(y+51)
x = -3/14*(y+51)
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