For X to be alone it'd be best to make the 1/3 a whole number.
1/3x + 1/2 = -5
multiply everything by 3.
so we'll get:
3x + 3/6 = -15
we want 3x alone, so we subtract 3/6, and we want to do the same to the other side.
so we'll get:
3x = -15 - 3/6
reminder: -3/6 is the same as -0.5
now we have:
3x = -15.5
we now divide both sides by 3 to get x alone (and find its value):
(3x = -15.5) ÷3
which will give us the final answer...
x = 5.1666666666666667
round it up:
x = 5.167