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m in (-oo:+oo)
5*(7*m+1) = -30 // + 30
5*(7*m+1)+30 = 0
5*(7*m+1)+30 = 0
35*m+35 = 0
35*m+35 = 0
35*m+35 = 0 // - 35
35*m = -35 // : 35
m = -35/35
m = -1
m = -1
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