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w in (-oo:+oo)
5*(6-4*w) = 10 // - 10
5*(6-4*w)-10 = 0
5*(6-4*w)-10 = 0
20-20*w = 0
20-20*w = 0
20-20*w = 0 // - 20
-20*w = -20 // : -20
w = -20/(-20)
w = 1
w = 1
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