Answer:
8 3 + 4 2 + 7 − 7
Explanation:
Distribute
(103+72−7)−1(23+32−7)
(103+72−7)−23−32+7
Eliminate redundant parentheses
(103+72−7)−23−32+7
103+72−7−23−32+7
Combine like terms
103+72−7−23−32+7
83+72−7−32+7
Combine like terms
83+72−7−32+7
83+42−7+7
Rearrange terms
83+42−7+7
83+42+7−7