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w in (-oo:+oo)
5*w+8 = 131/12 // - 131/12
5*w-(131/12)+8 = 0
5*w-131/12+8 = 0
5*w-35/12 = 0 // + 35/12
5*w = 35/12 // : 5
w = 35/12/5
w = 7/12
w = 7/12
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