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w in (-oo:+oo)
(1/4)*(w-4)-((3/4)*w) = 3 // - 3
(1/4)*(w-4)-((3/4)*w)-3 = 0
(1/4)*(w-4)+(-3/4)*w-3 = 0
1/4*(w-4)+(-3*w)/4-3 = 0
(1/4*4*(w-4))/4+(-3*w)/4+(-3*4)/4 = 0
1/4*4*(w-4)-3*w-3*4 = 0
-2*w-12-4 = 0
-2*w-16 = 0
(-2*w-16)/4 = 0
(-2*w-16)/4 = 0 // * 4
-2*w-16 = 0
-2*w-16 = 0 // + 16
-2*w = 16 // : -2
w = 16/(-2)
w = -8
w = -8
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