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w in (-oo:+oo)
4*w-(7/3) = (-3/5)*w-(3/5) // - (-3/5)*w-(3/5)
4*w-((-3/5)*w)-(7/3)+3/5 = 0
4*w+(3/5)*w-7/3+3/5 = 0
23/5*w-26/15 = 0 // + 26/15
23/5*w = 26/15 // : 23/5
w = 26/15/23/5
w = 26/69
w = 26/69
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