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m in (-oo:+oo)
m+5 = 71-5*m // - 71-5*m
m-(-5*m)-71+5 = 0
m+5*m-71+5 = 0
6*m-66 = 0 // + 66
6*m = 66 // : 6
m = 66/6
m = 11
m = 11
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