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x in (-oo:+oo)
y-6 = (2/3)*(x-5) // - (2/3)*(x-5)
y-((2/3)*(x-5))-6 = 0
(-2/3)*(x-5)+y-6 = 0
y-2/3*(x-5)-6 = 0
y-2/3*(x-5)-6 = 0
y-2/3*x-6+10/3 = 0
y-2/3*x-8/3 = 0
y-2/3*x-8/3 = 0
y-2/3*x-8/3 = 0 // - y-8/3
-2/3*x = -(y-8/3) // : -2/3
x = (-(y-8/3))/(-2/3)
x = -3/2*(8/3-y)
x = -3/2*(8/3-y)
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