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m in (-oo:+oo)
-69 = -5*m-(4*m)-6 // + -5*m-(4*m)-6
4*m-(-5*m)-69+6 = 0
5*m+4*m-69+6 = 0
9*m-63 = 0 // + 63
9*m = 63 // : 9
m = 63/9
m = 7
m = 7
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