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x in (-oo:+oo)
M-(7*m)-(16/3)-(21/5) = 1 // - 1
M-(7*m)-(16/3)-(21/5)-1 = 0
M-7*m-16/3-21/5-1 = 0
M-7*m-158/15 = 0
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x in (-oo:+oo)
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