Respuesta :
a. You could draw 42 chicken dinners and 18 steak dinners with a minus sign in between. Then an equal sign and the 42 chicken dinners with 18 crossed out.
b. 42-m=18, or m+18=42, or most simply 42-18=m or 24.
b. 42-m=18, or m+18=42, or most simply 42-18=m or 24.