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x in (-oo:+oo)
y-4 = (1/6)*(x-3) // - (1/6)*(x-3)
y-((1/6)*(x-3))-4 = 0
(-1/6)*(x-3)+y-4 = 0
y-1/6*(x-3)-4 = 0
y-1/6*(x-3)-4 = 0
y-1/6*x-4+1/2 = 0
y-1/6*x-7/2 = 0
y-1/6*x-7/2 = 0
y-1/6*x-7/2 = 0 // - y-7/2
-1/6*x = -(y-7/2) // : -1/6
x = (-(y-7/2))/(-1/6)
x = -6*(7/2-y)
x = -6*(7/2-y)
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