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w in (-oo:+oo)
(w-2)/4-3 = (w-6)/2 // - (w-6)/2
(w-2)/4-((w-6)/2)-3 = 0
(w-2)/4+(-1*(w-6))/2-3 = 0
(2*(w-2))/(2*4)+(-1*4*(w-6))/(2*4)+(-3*2*4)/(2*4) = 0
2*(w-2)-1*4*(w-6)-3*2*4 = 0
20-2*w-24 = 0
-2*w-4 = 0
(-2*w-4)/(2*4) = 0
(-2*w-4)/(2*4) = 0 // * 2*4
-2*w-4 = 0
-2*w-4 = 0 // + 4
-2*w = 4 // : -2
w = 4/(-2)
w = -2
w = -2
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