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w in (-oo:+oo)
(2/3)*w-7 = (-4/5)*w-(1/3) // - (-4/5)*w-(1/3)
(2/3)*w-((-4/5)*w)+1/3-7 = 0
(2/3)*w+(4/5)*w+1/3-7 = 0
22/15*w-20/3 = 0 // + 20/3
22/15*w = 20/3 // : 22/15
w = 20/3/22/15
w = 50/11
w = 50/11
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