## Basic College Mathematics (9th Edition)

According to the last step of order of operations, we must evaluate addition and subtraction from left to right. First, we only consider $-12-(-3)$. Change the minus sign to a plus sign and insert the opposite of the second number in place of the second number. $-12-(-3)=-12+(3)=-12+3=-9$ Next, we can add this to -2 by using the same process. $-9-(-2)=-9+(2)=-9+2=-7$