Then use the literal equations solution to obtain the solution 3x=-15

well this is smthing related to math ... but here's how we do it:

3x = - 15 ... 3x is in multiplication form ... and when it comes to the right it changes to division form ... which will become

x = - 15/3 and if we divide 3 and 15 we get 5 as 3 * 5 = 15

and as (+) and (-) = (-) ... the answer will be negative ... so the answer is - 5

I don't know how is this related to social studies but the answer is - 5; -;