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w in (-oo:+oo)
(4/5)*w+6 = -6/5 // + -6/5
(4/5)*w-(-6/5)+6 = 0
(4/5)*w+6/5+6 = 0
4/5*w+36/5 = 0 // - 36/5
4/5*w = -36/5 // : 4/5
w = -36/5/4/5
w = -9
w = -9
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