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m in (-oo:+oo)
12-((2/3)*m) = 10 // - 10
12-((2/3)*m)-10 = 0
(-2/3)*m-10+12 = 0
2-2/3*m = 0 // - 2
-2/3*m = -2 // : -2/3
m = -2/(-2/3)
m = 3
m = 3
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