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m in (-oo:+oo)
5*m-(3*m)+7 = 1 // - 1
5*m-(3*m)-1+7 = 0
5*m-3*m-1+7 = 0
2*m+6 = 0 // - 6
2*m = -6 // : 2
m = -6/2
m = -3
m = -3
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