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w in (-oo:+oo)
w/7 = -2/3 // + -2/3
w/7-(-2/3) = 0
w/7+2/3 = 0
1/7*w+2/3 = 0 // - 2/3
1/7*w = -2/3 // : 1/7
w = -2/3/1/7
w = -14/3
w = -14/3
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