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m in (-oo:+oo)
5*(3*m-6) = 150 // - 150
5*(3*m-6)-150 = 0
5*(3*m-6)-150 = 0
15*m-180 = 0
15*m-180 = 0
15*m-180 = 0 // + 180
15*m = 180 // : 15
m = 180/15
m = 12
m = 12
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