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m in (-oo:+oo)
3-(7*m) = 43/12 // - 43/12
3-(7*m)-(43/12) = 0
3-7*m-43/12 = 0
-7*m-7/12 = 0 // + 7/12
-7*m = 7/12 // : -7
m = 7/12/(-7)
m = -1/12
m = -1/12
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