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w in (-oo:+oo)
w/2-(3*4) = 53 // - 53
w/2-(3*4)-53 = 0
w/2-53-12 = 0
1/2*w-65 = 0 // + 65
1/2*w = 65 // : 1/2
w = 65/1/2
w = 130
w = 130
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