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w in (-oo:+oo)
-7/3 = (2*w)/5-(5/9) // - (2*w)/5-(5/9)
5/9-((2*w)/5)-7/3 = 0
(-2/5)*w-7/3+5/9 = 0
-2/5*w-16/9 = 0 // + 16/9
-2/5*w = 16/9 // : -2/5
w = 16/9/(-2/5)
w = -40/9
w = -40/9
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