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m in (-oo:+oo)
6*(5*m-5) = 300 // - 300
6*(5*m-5)-300 = 0
6*(5*m-5)-300 = 0
30*m-330 = 0
30*m-330 = 0
30*m-330 = 0 // + 330
30*m = 330 // : 30
m = 330/30
m = 11
m = 11
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