To add these two fractions, we need to find a common denominator. In this case, the common denominator is 28.
So, -3/7 + (-3/4) = (-12/28) + (-21/28)
Now we can add the numerators to get:
= (-12 - 21)/28
= -33/28
Therefore, the answer is -33/28.
-3/7 + (-3/4)
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