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m in (-oo:+oo)
(2/7)*m+4*m+1/3 = -443/21 // + -443/21
(2/7)*m+4*m+1/3-(-443/21) = 0
(2/7)*m+4*m+1/3+443/21 = 0
30/7*m+150/7 = 0 // - 150/7
30/7*m = -150/7 // : 30/7
m = -150/7/30/7
m = -5
m = -5
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