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w in (-oo:+oo)
(-7/3)*w+2/3 = -4*w-(7/2) // + -4*w-(7/2)
(-7/3)*w-(-4*w)+2/3+7/2 = 0
(-7/3)*w+4*w+2/3+7/2 = 0
5/3*w+25/6 = 0 // - 25/6
5/3*w = -25/6 // : 5/3
w = -25/6/5/3
w = -5/2
w = -5/2
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