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w in (-oo:+oo)
(1/3)*w = -4/3 // + -4/3
(1/3)*w-(-4/3) = 0
(1/3)*w+4/3 = 0
1/3*w+4/3 = 0 // - 4/3
1/3*w = -4/3 // : 1/3
w = -4/3/1/3
w = -4
w = -4
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