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y-6 = (-5/3)*(x+9) // - (-5/3)*(x+9)
y-((-5/3)*(x+9))-6 = 0
(5/3)*(x+9)+y-6 = 0
5/3*(x+9)+y-6 = 0
5/3*(x+9)+y-6 = 0
5/3*x+y-6+15 = 0
5/3*x+y+9 = 0
5/3*x+y+9 = 0
5/3*x+y+9 = 0 // - y+9
5/3*x = -(y+9) // : 5/3
x = (-(y+9))/5/3
x = -3/5*(y+9)
x = -3/5*(y+9)
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