Answer:
Step-by-step explanation:
in order to be like terms, they have to have the same variable (and exponent, if there is any).....or be just a constant with no variables (just a number)
like terms in 12a - 7 + 7a + 12b are :
12a and 7a....because they have the exact same variable (a)
12b....no like terms
-7...no like terms
so ur answer is : 12a and 7a
