To clear 'w' the first step is to take -7 to the other side of the equality sign. It goes with opposite sign, so possitive:
Now 5 goes to the other side with opposite operation. Since it's multiplying it has to divide on the other side:
Now we have to take 2 to the other side with possitive sign:
Finally, 3 has to divide all the expression on the right side:
And solve (you can also solve in the steps to make it easier):