Final answer:
To solve -3/7 + (-3/4), convert each fraction to have a common denominator of 28. The result is -12/28 + (-21/28), which equals -33/28 or -1 5/28 when simplified.
Step-by-step explanation:
To solve the problem -\dfrac{3}{7}+\left(-\dfrac{3}{4}\right), you combine the two fractions by finding a common denominator, which in this case is 28. Then, you convert each fraction to have this common denominator and add the numerators together while keeping the same denominator.
In this case, the common denominator is 28. We multiply the numerator and denominator of the first fraction by 4 to get -\dfrac{12}{28}, and multiply the numerator and denominator of the second fraction by 7 to get -\dfrac{21}{28}. Next, we add the numerators: -12 + (-21) = -33. So the answer is -\dfrac{33}{28}.
The first fraction becomes -\dfrac{12}{28} and the second becomes -\dfrac{21}{28}. Adding these together, we get -\dfrac{12}{28} - \dfrac{21}{28} = -\dfrac{33}{28}, which can also be simplified to -1 \dfrac{5}{28} if you prefer a mixed number.
Thus, the answer to -\dfrac{3}{7}+\left(-\dfrac{3}{4}\right) is -1 \dfrac{5}{28}.