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m in (-oo:+oo)
m+1 = 7*m-65 // - 7*m-65
m-(7*m)+1+65 = 0
m-7*m+1+65 = 0
66-6*m = 0 // - 66
-6*m = -66 // : -6
m = -66/(-6)
m = 11
m = 11
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