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w in (-oo:+oo)
-(2*w)-((1/2)*w)-4 = -43/2 // + -43/2
-(2*w)-((1/2)*w)-(-43/2)-4 = 0
(-1/2)*w-2*w+43/2-4 = 0
35/2-5/2*w = 0 // - 35/2
-5/2*w = -35/2 // : -5/2
w = -35/2/(-5/2)
w = 7
w = 7
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