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