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w in (-oo:+oo)
(-4/5)*w+1 = (-7/2)*w-(3/2) // - (-7/2)*w-(3/2)
(-4/5)*w-((-7/2)*w)+3/2+1 = 0
(-4/5)*w+(7/2)*w+3/2+1 = 0
27/10*w+5/2 = 0 // - 5/2
27/10*w = -5/2 // : 27/10
w = -5/2/27/10
w = -25/27
w = -25/27
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