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m in (-oo:+oo)
(1*21)/3 = 3*m-((2*2)/3) // - 3*m-((2*2)/3)
(1*21)/3-(3*m)+(2*2)/3 = 0
21/3-3*m+(2*2)/3 = 0
25/3-3*m = 0 // - 25/3
-3*m = -25/3 // : -3
m = -25/3/(-3)
m = 25/9
m = 25/9
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