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w in (-oo:+oo)
-(4*w)-(6*w)-4 = 16 // - 16
-(4*w)-(6*w)-16-4 = 0
-4*w-6*w-16-4 = 0
-10*w-20 = 0 // + 20
-10*w = 20 // : -10
w = 20/(-10)
w = -2
w = -2
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