SOLUTION
Given question 3 in the image, the following are the solution steps to answer the question.
STEP 1: Write the given expression

STEP 2: To simplify the expressions, Use the distributive property to open the brackets

STEP 3: Collect like terms

STEP 4: Subtract the t part

STEP 5: Subtract the s part of the expression in Step 3

STEP 6: Rewrite the expressions gotten to produce the final expression

Hence, the final expression from adding the two expressions are:
