Mathematics
OpenStudy (anonymous):

13 = w/-3 - 4

OpenStudy (anonymous):

To find out what w is start by adding the 4 to each side. your new equation would look like this: 13 + 4 = w/-3. Next step is to isolate the variable by multiplying -3 to each side. Your new equation is 17 $\times$ -3 = w. To solve just multiply 17 and -3 :)