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w in (-oo:+oo)
(1/3)*w+3 = 31/10 // - 31/10
(1/3)*w-(31/10)+3 = 0
(1/3)*w-31/10+3 = 0
1/3*w-1/10 = 0 // + 1/10
1/3*w = 1/10 // : 1/3
w = 1/10/1/3
w = 3/10
w = 3/10
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