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w in (-oo:+oo)
-13 = w/3-7 // - w/3-7
7-(w/3)-13 = 0
-1/3*w-6 = 0 // + 6
-1/3*w = 6 // : -1/3
w = 6/(-1/3)
w = -18
w = -18
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