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w in (-oo:+oo)
-1052/105 = (5/7)*w-((2/3)*w)-10 // - (5/7)*w-((2/3)*w)-10
(2/3)*w-((5/7)*w)-1052/105+10 = 0
(-5/7)*w+(2/3)*w-1052/105+10 = 0
-1/21*w-2/105 = 0 // + 2/105
-1/21*w = 2/105 // : -1/21
w = 2/105/(-1/21)
w = -2/5
w = -2/5
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