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w in (-oo:+oo)
(3/7)*w-11 = -4/7 // + -4/7
(3/7)*w-(-4/7)-11 = 0
(3/7)*w+4/7-11 = 0
3/7*w-73/7 = 0 // + 73/7
3/7*w = 73/7 // : 3/7
w = 73/7/3/7
w = 73/3
w = 73/3
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