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w in (-oo:+oo)
7*w+8 = 10/3 // - 10/3
7*w-(10/3)+8 = 0
7*w-10/3+8 = 0
7*w+14/3 = 0 // - 14/3
7*w = -14/3 // : 7
w = -14/3/7
w = -2/3
w = -2/3
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