You can put this solution on YOUR website! Both numbers are negative, so you add the numbers (ignore the negative signs) to get 10+7 = 17
Then you make the result negative since both numbers are negative to get the final answer to be -17
Real World Example: you are 10 dollars in debt (represented by the integer -10) and you go 7 more dollars in debt (-7). In total, you are 17 dollars in debt (-17)