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x in (-oo:+oo)
(2/5)*w = 3.5*b // - 3.5*b
(2/5)*w-(3.5*b) = 0
(2/5)*w-3.5*b = 0
2/5*w-3.5*b = 0
x naleu017Cy do R
x in (-oo:+oo)
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