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m in (-oo:+oo)
4*m+m/3 = -20 // + 20
4*m+m/3+20 = 0
13/3*m+20 = 0 // - 20
13/3*m = -20 // : 13/3
m = -20/13/3
m = -60/13
m = -60/13
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