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w in (-oo:+oo)
2*w+5/6 = 15-(3*w)-(1/2) // - 15-(3*w)-(1/2)
2*w+3*w+5/6+1/2-15 = 0
5*w-41/3 = 0 // + 41/3
5*w = 41/3 // : 5
w = 41/3/5
w = 41/15
w = 41/15
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