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w in (-oo:+oo)
-36 = (6/7)*w // - (6/7)*w
-((6/7)*w)-36 = 0
(-6/7)*w-36 = 0
-6/7*w-36 = 0 // + 36
-6/7*w = 36 // : -6/7
w = 36/(-6/7)
w = -42
w = -42
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