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m in (-oo:+oo)
(2/3)*m = m/3-10 // - m/3-10
(2/3)*m-(m/3)+10 = 0
1/3*m+10 = 0 // - 10
1/3*m = -10 // : 1/3
m = -10/1/3
m = -30
m = -30
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