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w in (-oo:+oo)
7*w+1/6 = 253/6 // - 253/6
7*w+1/6-(253/6) = 0
7*w+1/6-253/6 = 0
7*w-42 = 0 // + 42
7*w = 42 // : 7
w = 42/7
w = 6
w = 6
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