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m in (-oo:+oo)
7*m-2 = 3*m+38 // - 3*m+38
7*m-(3*m)-38-2 = 0
7*m-3*m-38-2 = 0
4*m-40 = 0 // + 40
4*m = 40 // : 4
m = 40/4
m = 10
m = 10
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