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w in (-oo:+oo)
-5*w-4 = -3/2 // + -3/2
-5*w-(-3/2)-4 = 0
3/2-5*w-4 = 0
-5*w-5/2 = 0 // + 5/2
-5*w = 5/2 // : -5
w = 5/2/(-5)
w = -1/2
w = -1/2
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