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m in (-oo:+oo)
7*m-(5*m)+6 = 2 // - 2
7*m-(5*m)-2+6 = 0
7*m-5*m-2+6 = 0
2*m+4 = 0 // - 4
2*m = -4 // : 2
m = -4/2
m = -2
m = -2
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