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w in (-oo:+oo)
(4/7)*w-3 = 7 // - 7
(4/7)*w-7-3 = 0
4/7*w-10 = 0 // + 10
4/7*w = 10 // : 4/7
w = 10/4/7
w = 35/2
w = 35/2
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