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x in (-oo:+oo)
y-3 = (-2/3)*(x-5) // - (-2/3)*(x-5)
y-((-2/3)*(x-5))-3 = 0
(2/3)*(x-5)+y-3 = 0
2/3*(x-5)+y-3 = 0
2/3*(x-5)+y-3 = 0
2/3*x+y-10/3-3 = 0
2/3*x+y-19/3 = 0
2/3*x+y-19/3 = 0
2/3*x+y-19/3 = 0 // - y-19/3
2/3*x = -(y-19/3) // : 2/3
x = (-(y-19/3))/2/3
x = 3/2*(19/3-y)
x = 3/2*(19/3-y)
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