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m in (-oo:+oo)
(-2/3)*m-4 = 10 // - 10
(-2/3)*m-10-4 = 0
-2/3*m-14 = 0 // + 14
-2/3*m = 14 // : -2/3
m = 14/(-2/3)
m = -21
m = -21
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