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m in (-oo:+oo)
4*m+3 = m+0 // - m+0
4*m-m+0+3 = 0
4*m-m+3 = 0
3*m+3 = 0 // - 3
3*m = -3 // : 3
m = -3/3
m = -1
m = -1
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