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x in (-oo:+oo)
y-4 = (-1/3)*(x-3) // - (-1/3)*(x-3)
y-((-1/3)*(x-3))-4 = 0
(1/3)*(x-3)+y-4 = 0
1/3*(x-3)+y-4 = 0
1/3*(x-3)+y-4 = 0
1/3*x+y-4-1 = 0
1/3*x+y-5 = 0
1/3*x+y-5 = 0
1/3*x+y-5 = 0 // - y-5
1/3*x = -(y-5) // : 1/3
x = (-(y-5))/1/3
x = 3*(5-y)
x = 3*(5-y)
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