Question

3c+-9=18 I don't know how to do this problems ​

Answer 1

3c+-9=18

+-=-

3c-9=18

move 9c to the other side and the sign changes from negative to positive.

3c-9+9= 18+9

3c= 27

Divide by 3

c=9

Answer 2

3 because you have to add -9 to 18 then divide 3c by tht answer