Solve =-6/7+4/21

$$= \frac { - 6 } { 7 } + \frac { 4 } { 21 }$$

Evaluate

$$-\frac{2}{3}\approx -0.666666667$$

Solution Steps

Fraction \frac{-6}{7} can be rewritten as -\frac{6}{7} by extracting the negative sign.

$$-\frac{6}{7}+\frac{4}{21}$$

Least common multiple of 7 and 21 is 21. Convert -\frac{6}{7} and \frac{4}{21} to fractions with denominator 21.

$$-\frac{18}{21}+\frac{4}{21}$$

Since -\frac{18}{21} and \frac{4}{21} have the same denominator, add them by adding their numerators.

$$\frac{-18+4}{21}$$

Add -18 and 4 to get -14.

$$\frac{-14}{21}$$

Reduce the fraction \frac{-14}{21} to lowest terms by extracting and canceling out 7.

$$-\frac{2}{3}$$

Factor

$$-\frac{2}{3} = -0.6666666666666666$$