Overall review

Combine like terms:

7a+2a

Solve the equation: $4\times5-7+8$  

Solve the equation when D=5 and B=7

2D-4B

Distribute and solve:

6(4+8)

Solve the equation:

4-3

Solve: $6\left(5-6\right)+8^2-67$  

Solve the operation when R=6 and K= 3:

3-R+5(K-2)

Distribute and solve:

9(4x+3s-8K)

Combine like terms:

6c+7c+c

Solve:

-293-456