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x in (-oo:+oo)
y+9 = (5/3)*(x+5) // - (5/3)*(x+5)
y-((5/3)*(x+5))+9 = 0
(-5/3)*(x+5)+y+9 = 0
y-5/3*(x+5)+9 = 0
y-5/3*(x+5)+9 = 0
y-5/3*x-25/3+9 = 0
y-5/3*x+2/3 = 0
y-5/3*x+2/3 = 0
y-5/3*x+2/3 = 0 // - y+2/3
-5/3*x = -(y+2/3) // : -5/3
x = (-(y+2/3))/(-5/3)
x = 3/5*(y+2/3)
x = 3/5*(y+2/3)
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