Exercise arithmetic.fractions

Description
simplify fractions

Derivation

Final term is not finished

(2/3+2/7)/(12/21-1/3)

⇒ algebra.manipulation.fraction-plus-scale

(2/3+2/7)/(12/21-7/21)

⇒ algebra.manipulation.fraction-plus

(2/3+2/7)/(5/21)