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w in (-oo:+oo)
w-(4/9)-(2/3) = -4/5 // + -4/5
w-(4/9)-(2/3)-(-4/5) = 0
w-4/9-2/3+4/5 = 0
w-14/45 = 0 // + 14/45
w = 14/45
w = 14/45
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