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w in (-oo:+oo)
-3*w-(1/7) = -106/7 // + -106/7
-3*w-(1/7)-(-106/7) = 0
106/7-3*w-1/7 = 0
15-3*w = 0 // - 15
-3*w = -15 // : -3
w = -15/(-3)
w = 5
w = 5
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