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w in (-oo:+oo)
(3/7)*w-8/5 = -3/2 // + -3/2
(3/7)*w-8/5-(-3/2) = 0
(3/7)*w-8/5+3/2 = 0
3/7*w-1/10 = 0 // + 1/10
3/7*w = 1/10 // : 3/7
w = 1/10/3/7
w = 7/30
w = 7/30
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