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m in (-oo:+oo)
15*m+3/2 = -6 // + 6
15*m+3/2+6 = 0
15*m+15/2 = 0 // - 15/2
15*m = -15/2 // : 15
m = -15/2/15
m = -1/2
m = -1/2
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