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m in (-oo:+oo)
4*m-(2*m)+7 = -3 // + 3
4*m-(2*m)+3+7 = 0
4*m-2*m+3+7 = 0
2*m+10 = 0 // - 10
2*m = -10 // : 2
m = -10/2
m = -5
m = -5
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