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m in (-oo:+oo)
5*(7*m+5) = -220 // + 220
5*(7*m+5)+220 = 0
5*(7*m+5)+220 = 0
35*m+245 = 0
35*m+245 = 0
35*m+245 = 0 // - 245
35*m = -245 // : 35
m = -245/35
m = -7
m = -7
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