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m in (-oo:+oo)
7*m+1 = 3*m+29 // - 3*m+29
7*m-(3*m)-29+1 = 0
7*m-3*m-29+1 = 0
4*m-28 = 0 // + 28
4*m = 28 // : 4
m = 28/4
m = 7
m = 7
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