Solve the Expression: 28÷(210÷15)-(12+42) Order of Operations Challenge

To solve this problem, we'll follow these steps:

• Step 1: Calculate the expression inside the parentheses by performing the division $210:15$.
• Step 2: Add the numbers inside the other parentheses, $12 + 42$.
• Step 3: Use the result from Step 1 to perform the division $28:\text{(result of Step 1)}$.
• Step 4: Subtract the result of Step 2 from the result of Step 3.

Now, let's work through each step:
Step 1: Compute $210 : 15 = 14$.
Step 2: Compute $12 + 42 = 54$.
Step 3: Compute the division $28 : 14 = 2$.
Step 4: Finally, compute the subtraction $2 - 54 = -52$.

Therefore, the solution to the problem is $-52$.