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w in (-oo:+oo)
(-2/7)*w-7 = -9 // + 9
(-2/7)*w-7+9 = 0
2-2/7*w = 0 // - 2
-2/7*w = -2 // : -2/7
w = -2/(-2/7)
w = 7
w = 7
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