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m in (-oo:+oo)
3-2*m = 5*m-60 // - 5*m-60
3-2*m-(5*m)+60 = 0
3-2*m-5*m+60 = 0
63-7*m = 0 // - 63
-7*m = -63 // : -7
m = -63/(-7)
m = 9
m = 9
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