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1/2X + 1/3X + 1/12X + 1 = X
1/2X + 1/3X + 1/12X - X = -1
X(1/2 + 1/3 + 1/12 - 1) = -1
X((6+4+1-12)/12) = -1
-1/12X = -1
X = 12 R//.