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x in (-oo:+oo)
(4/5)*m-t = 7*b // - 7*b
(4/5)*m-(7*b)-t = 0
(4/5)*m-7*b-t = 0
4/5*m-7*b-t = 0
x naleu017Cy do R
x in (-oo:+oo)
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