Question

(4 целых 8/21+x) - 7 целых 13/21 = 2 целых 12/21 помогите!!

Answer 1

$(4 frac{8}{21}+x)-7 frac{13}{21} =2 frac{12}{21} \ \ x =2 frac{12}{21}+7 frac{13}{21}-4 frac{8}{21} \ \ x=5 frac{17}{21}$