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w in (-oo:+oo)
5*(2*w+2) = 40 // - 40
5*(2*w+2)-40 = 0
5*(2*w+2)-40 = 0
10*w-30 = 0
10*w-30 = 0
10*w-30 = 0 // + 30
10*w = 30 // : 10
w = 30/10
w = 3
w = 3
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