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w in (-oo:+oo)
7*(-5*w-2) = -294 // + 294
7*(-5*w-2)+294 = 0
7*(-5*w-2)+294 = 0
280-35*w = 0
280-35*w = 0
280-35*w = 0 // - 280
-35*w = -280 // : -35
w = -280/(-35)
w = 8
w = 8
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