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m in (-oo:+oo)
4*m+1/3 = 121/3 // - 121/3
4*m+1/3-(121/3) = 0
4*m+1/3-121/3 = 0
4*m-40 = 0 // + 40
4*m = 40 // : 4
m = 40/4
m = 10
m = 10
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