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m in (-oo:+oo)
6*m+8 = 7*m+4 // - 7*m+4
6*m-(7*m)-4+8 = 0
6*m-7*m-4+8 = 0
4-m = 0 // - 4
-m = -4 // * -1
m = 4
m = 4
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