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m in (-oo:+oo)
6*m-(4*m)-7 = -23 // + 23
6*m-(4*m)-7+23 = 0
6*m-4*m-7+23 = 0
2*m+16 = 0 // - 16
2*m = -16 // : 2
m = -16/2
m = -8
m = -8
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