13 CM + 5 CM - 7 CM =

Question

80 - 40 + 20   = ...      13 cm + 5 cm  - 7 cm  =  ...      b/    428675     + 6220+-15 3336      ...       ...      ...      ...

Answer

80 - 40 + 20   = ...      13 cm + 5 cm  - 7 cm  =  ...      b/    428675     + 6220+-15 3336      ...       ...      ...      ...