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w in (-oo:+oo)
1/6-7*w = -92/15 // + -92/15
1/6-7*w-(-92/15) = 0
1/6-7*w+92/15 = 0
63/10-7*w = 0 // - 63/10
-7*w = -63/10 // : -7
w = -63/10/(-7)
w = 9/10
w = 9/10
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