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w in (-oo:+oo)
(1/4)*(w-4)-((3/4)*w) = 4 // - 4
(1/4)*(w-4)-((3/4)*w)-4 = 0
(1/4)*(w-4)+(-3/4)*w-4 = 0
1/4*(w-4)+(-3*w)/4-4 = 0
(1/4*4*(w-4))/4+(-3*w)/4+(-4*4)/4 = 0
1/4*4*(w-4)-3*w-4*4 = 0
-2*w-16-4 = 0
-2*w-20 = 0
(-2*w-20)/4 = 0
(-2*w-20)/4 = 0 // * 4
-2*w-20 = 0
-2*w-20 = 0 // + 20
-2*w = 20 // : -2
w = 20/(-2)
w = -10
w = -10
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