Here in this problem your adding. To do that start with aligning the problem vertically. Like this 3 1/2 now you add the halves which equal a + 2 1/2 whole. So now you add 3+2+1 which equals 6. 6 is the complete answer.
Replace each x in the expression/equation with the given value. Then use order of operations to simplify and solve. There are some great videos out there explaining the concept.
