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x in (-oo:+oo)
y+3 = (-5/3)*(x+18) // - (-5/3)*(x+18)
y-((-5/3)*(x+18))+3 = 0
(5/3)*(x+18)+y+3 = 0
5/3*(x+18)+y+3 = 0
5/3*(x+18)+y+3 = 0
5/3*x+y+3+30 = 0
5/3*x+y+33 = 0
5/3*x+y+33 = 0
5/3*x+y+33 = 0 // - y+33
5/3*x = -(y+33) // : 5/3
x = (-(y+33))/5/3
x = -3/5*(y+33)
x = -3/5*(y+33)
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