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m in (-oo:+oo)
3*m+m+4 = 4/5 // - 4/5
3*m+m-(4/5)+4 = 0
3*m+m-4/5+4 = 0
4*m+16/5 = 0 // - 16/5
4*m = -16/5 // : 4
m = -16/5/4
m = -4/5
m = -4/5
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