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m in (-oo:+oo)
7*m+8 = 31/3 // - 31/3
7*m-(31/3)+8 = 0
7*m-31/3+8 = 0
7*m-7/3 = 0 // + 7/3
7*m = 7/3 // : 7
m = 7/3/7
m = 1/3
m = 1/3
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