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w in (-oo:+oo)
5*(4*w-10) = -10 // + 10
5*(4*w-10)+10 = 0
5*(4*w-10)+10 = 0
20*w-40 = 0
20*w-40 = 0
20*w-40 = 0 // + 40
20*w = 40 // : 20
w = 40/20
w = 2
w = 2
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