First, both the fractions need a common denominator. The least common multiple of 4 and 3 is 12. Now multiple each fraction by the value required to have a denominator of 12. In this case, we are going to multiply 3/4 by 3/3 and 1/3 by 4/4.
Now we have 9/12 - 4/12.
The final answer is 5/12, which cannot be simplified.
Easy you have to convert them so they have the same denominator so in reality multiply the bottom
4x3 = 12
then you get both the top numbers and multiply them by what there denominator was multiplied by so
it would be 9/12 and 4/12
9/12 minus 4/12 equals 5/12
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1/8
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7/20