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m in (-oo:+oo)
7*m-(2*m)-3 = 17 // - 17
7*m-(2*m)-17-3 = 0
7*m-2*m-17-3 = 0
5*m-20 = 0 // + 20
5*m = 20 // : 5
m = 20/5
m = 4
m = 4
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