**10 points and brainliest** simplify 8^2+9(12÷3x2)-7 and explain each step

First of all, we must solve the parenthesis. Inside the parenthesis we have a division and a multiplication, which are operation with the same priority. So, we perform them as they appears:

Now we have an exponential, a multiplication and a subtraction. The highest priority is the exponential:

Next the multiplication:

Now we only have sum and subtraction. We can perform these operations in order: