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w in (-oo:+oo)
3*w-(5*w)-4 = -28 // + 28
3*w-(5*w)-4+28 = 0
3*w-5*w-4+28 = 0
24-2*w = 0 // - 24
-2*w = -24 // : -2
w = -24/(-2)
w = 12
w = 12
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