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4\left(3\times 3+1\right)<39
Multiply both sides of the equation by 12, the least common multiple of 3,4. Since 12 is positive, the inequality direction remains the same.
4\left(9+1\right)<39
Multiply 3 and 3 to get 9.
4\times 10<39
Add 9 and 1 to get 10.
40<39
Multiply 4 and 10 to get 40.
\text{false}
Compare 40 and 39.
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