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m in (-oo:+oo)
(-1/3)*m-3 = 7 // - 7
(-1/3)*m-7-3 = 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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