Exercise arithmetic.fractions

Description
simplify fractions

Derivation

Final term is not finished

(14/21+6/21)/(12/21-1/3)

⇒ algebra.manipulation.fraction-plus-scale

(14/21+6/21)/(12/21-7/21)

⇒ algebra.manipulation.fraction-plus

(14/21+6/21)/(5/21)