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w in (-oo:+oo)
7*(w-2) = 35 // - 35
7*(w-2)-35 = 0
7*(w-2)-35 = 0
7*w-49 = 0
7*w-49 = 0
7*w-49 = 0 // + 49
7*w = 49 // : 7
w = 49/7
w = 7
w = 7
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