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m in (-oo:+oo)
1-(3*m) = m-31 // - m-31
1-(3*m)-m+31 = 0
1-3*m-m+31 = 0
32-4*m = 0 // - 32
-4*m = -32 // : -4
m = -32/(-4)
m = 8
m = 8
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