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w in (-oo:+oo)
(3/7)*w-4.7 = -3.8 // + 3.8
(3/7)*w-4.7+3.8 = 0
3/7*w-0.9 = 0 // + 0.9
3/7*w = 0.9 // : 3/7
w = 0.9/3/7
w = 2.09999999
w = 2.09999999
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