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w in (-oo:+oo)
4*w+(4/5)*w-9 = -69/5 // + -69/5
4*w+(4/5)*w-(-69/5)-9 = 0
4*w+(4/5)*w+69/5-9 = 0
24/5*w+24/5 = 0 // - 24/5
24/5*w = -24/5 // : 24/5
w = -24/5/24/5
w = -1
w = -1
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