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m in (-oo:+oo)
7*(6*m+5) = 287 // - 287
7*(6*m+5)-287 = 0
7*(6*m+5)-287 = 0
42*m-252 = 0
42*m-252 = 0
42*m-252 = 0 // + 252
42*m = 252 // : 42
m = 252/42
m = 6
m = 6
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