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m in (-oo:+oo)
-18 = m-4*m-3 // - m-4*m-3
3-(-4*m)-m-18 = 0
4*m-m-18+3 = 0
3*m-15 = 0 // + 15
3*m = 15 // : 3
m = 15/3
m = 5
m = 5
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