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It is not clear which of the two xs that appear in the expression you refer to; nor is there an inequality or inequality sign in the first part of the question.
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12 divided by 3 equals 4. Then, 4 times 3 equals 12. Finally, 4 plus 12 equals 16.
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In 6x + 4 = 12, x = 4/3
(x+3)(x+4)=x2+7x+12
1/4 + 1/3 = 3/12 + 4/12 (12 is the least common multiple of 3 and 4) = 7/12