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w in (-oo:+oo)
(-5/2)*w+6 = (-4/3)*w-(5/3) // - (-4/3)*w-(5/3)
(-5/2)*w-((-4/3)*w)+5/3+6 = 0
(-5/2)*w+(4/3)*w+5/3+6 = 0
23/3-7/6*w = 0 // - 23/3
-7/6*w = -23/3 // : -7/6
w = -23/3/(-7/6)
w = 46/7
w = 46/7
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