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m in (-oo:+oo)
7*m-(3*m)+9 = -23 // + 23
7*m-(3*m)+9+23 = 0
7*m-3*m+9+23 = 0
4*m+32 = 0 // - 32
4*m = -32 // : 4
m = -32/4
m = -8
m = -8
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