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x in (-oo:+oo)
y = (2/3)*(x-5) // - (2/3)*(x-5)
y-((2/3)*(x-5)) = 0
(-2/3)*(x-5)+y = 0
y-2/3*(x-5) = 0
y-2/3*(x-5) = 0
y-2/3*x+10/3 = 0
y-2/3*x+10/3 = 0
y-2/3*x+10/3 = 0 // - y+10/3
-2/3*x = -(y+10/3) // : -2/3
x = (-(y+10/3))/(-2/3)
x = 3/2*(y+10/3)
x = 3/2*(y+10/3)
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