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m in (-oo:+oo)
5*(3*m-6) = -90 // + 90
5*(3*m-6)+90 = 0
5*(3*m-6)+90 = 0
15*m+60 = 0
15*m+60 = 0
15*m+60 = 0 // - 60
15*m = -60 // : 15
m = -60/15
m = -4
m = -4
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