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m in (-oo:+oo)
7*(3*m+9) = 168 // - 168
7*(3*m+9)-168 = 0
7*(3*m+9)-168 = 0
21*m-105 = 0
21*m-105 = 0
21*m-105 = 0 // + 105
21*m = 105 // : 21
m = 105/21
m = 5
m = 5
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