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m in (-oo:+oo)
14 = m-3*m+8 // - m-3*m+8
14-(-3*m)-m-8 = 0
3*m-m-8+14 = 0
2*m+6 = 0 // - 6
2*m = -6 // : 2
m = -6/2
m = -3
m = -3
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