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w in (-oo:+oo)
-13.8 = w/7-2.6 // - w/7-2.6
2.6-(w/7)-13.8 = 0
-1/7*w-11.2 = 0 // + 11.2
-1/7*w = 11.2 // : -1/7
w = 11.2/(-1/7)
w = -78.40000157
w = -78.40000157
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