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w in (-oo:+oo)
(1/5)*w-7 = (-4/5)*w // - (-4/5)*w
(1/5)*w-((-4/5)*w)-7 = 0
(1/5)*w+(4/5)*w-7 = 0
w-7 = 0 // + 7
w = 7
w = 7
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