exam Maths Puzzle Numerical Ability

im not understanding how to do this work.

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Here is the problem: 5t+6+3(t+2)
I need to find the Communitive, Distributive, Addition, and Identity of this equation.

Here are my answers: (5t+6+3t+6)
Communitive: 5t+3t+6+6
Distributive: 8t+12

Is this correct? ok i have to solve this equation.

S=2WL+2LH+2WH (solve for L)