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m in (-oo:+oo)
5*(7*m-8) = 275 // - 275
5*(7*m-8)-275 = 0
5*(7*m-8)-275 = 0
35*m-315 = 0
35*m-315 = 0
35*m-315 = 0 // + 315
35*m = 315 // : 35
m = 315/35
m = 9
m = 9
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