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m in (-oo:+oo)
5*(2-7*m) = -25 // + 25
5*(2-7*m)+25 = 0
5*(2-7*m)+25 = 0
35-35*m = 0
35-35*m = 0
35-35*m = 0 // - 35
-35*m = -35 // : -35
m = -35/(-35)
m = 1
m = 1
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