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w in (-oo:+oo)
(4/7)*w-6 = -54/7 // + -54/7
(4/7)*w-(-54/7)-6 = 0
(4/7)*w+54/7-6 = 0
4/7*w+12/7 = 0 // - 12/7
4/7*w = -12/7 // : 4/7
w = -12/7/4/7
w = -3
w = -3
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