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m in (-oo:+oo)
m-(5*m)-(8/3)+7/7 = 1 // - 1
m-(5*m)-(8/3)+7/7-1 = 0
m-5*m-8/3+7/7-1 = 0
-4*m-8/3 = 0 // + 8/3
-4*m = 8/3 // : -4
m = 8/3/(-4)
m = -2/3
m = -2/3
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