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m in (-oo:+oo)
3*m+4 = 7*m-20 // - 7*m-20
3*m-(7*m)+4+20 = 0
3*m-7*m+4+20 = 0
24-4*m = 0 // - 24
-4*m = -24 // : -4
m = -24/(-4)
m = 6
m = 6
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