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m in (-oo:+oo)
59 = m-7*m+5 // - m-7*m+5
59-(-7*m)-m-5 = 0
7*m-m-5+59 = 0
6*m+54 = 0 // - 54
6*m = -54 // : 6
m = -54/6
m = -9
m = -9
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