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x in (-oo:+oo)
y-8 = (2/3)*(x-10) // - (2/3)*(x-10)
y-((2/3)*(x-10))-8 = 0
(-2/3)*(x-10)+y-8 = 0
y-2/3*(x-10)-8 = 0
y-2/3*(x-10)-8 = 0
y-2/3*x-8+20/3 = 0
y-2/3*x-4/3 = 0
y-2/3*x-4/3 = 0
y-2/3*x-4/3 = 0 // - y-4/3
-2/3*x = -(y-4/3) // : -2/3
x = (-(y-4/3))/(-2/3)
x = -3/2*(4/3-y)
x = -3/2*(4/3-y)
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