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m in (-oo:+oo)
5*(7*m-1) = 345 // - 345
5*(7*m-1)-345 = 0
5*(7*m-1)-345 = 0
35*m-350 = 0
35*m-350 = 0
35*m-350 = 0 // + 350
35*m = 350 // : 35
m = 350/35
m = 10
m = 10
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