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w in (-oo:+oo)
(3*w)/15+1/5 = 45 // - 45
(3*w)/15+1/5-45 = 0
1/5*w-224/5 = 0 // + 224/5
1/5*w = 224/5 // : 1/5
w = 224/5/1/5
w = 224
w = 224
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