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w in (-oo:+oo)
(-7/2)*w+4 = (-5/3)*w-(7/3) // - (-5/3)*w-(7/3)
(-7/2)*w-((-5/3)*w)+7/3+4 = 0
(-7/2)*w+(5/3)*w+7/3+4 = 0
19/3-11/6*w = 0 // - 19/3
-11/6*w = -19/3 // : -11/6
w = -19/3/(-11/6)
w = 38/11
w = 38/11
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