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w in (-oo:+oo)
(-7/2)*w+3 = (-7/6)*w-(4/3) // - (-7/6)*w-(4/3)
(-7/2)*w-((-7/6)*w)+4/3+3 = 0
(-7/2)*w+(7/6)*w+4/3+3 = 0
13/3-7/3*w = 0 // - 13/3
-7/3*w = -13/3 // : -7/3
w = -13/3/(-7/3)
w = 13/7
w = 13/7
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