it is 3
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To simplify 126 over 15, we first find the greatest common divisor (GCD) of 126 and 15, which is 3. Dividing both the numerator and denominator by 3 gives us 42 over 5. Therefore, 126 over 15 simplified is 42 over 5.
31/42 is already simplified
It is: 42/100 = 21/50 simplified
It is: 36/42 = 6/7 simplified
126/12 = 21/2 or 10.5